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-//
-// read_until.hpp
-// ~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
-//
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-#ifndef ASIO_READ_UNTIL_HPP
-#define ASIO_READ_UNTIL_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include <cstddef>
-#include <string>
-#include "asio/async_result.hpp"
-#include "asio/detail/regex_fwd.hpp"
-#include "asio/detail/string_view.hpp"
-#include "asio/detail/type_traits.hpp"
-#include "asio/error.hpp"
-
-#if !defined(ASIO_NO_EXTENSIONS)
-# include "asio/basic_streambuf_fwd.hpp"
-#endif // !defined(ASIO_NO_EXTENSIONS)
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-namespace detail
-{
-  char (&has_result_type_helper(...))[2];
-
-  template <typename T>
-  char has_result_type_helper(T*, typename T::result_type* = 0);
-
-  template <typename T>
-  struct has_result_type
-  {
-    enum { value = (sizeof((has_result_type_helper)((T*)(0))) == 1) };
-  };
-} // namespace detail
-
-/// Type trait used to determine whether a type can be used as a match condition
-/// function with read_until and async_read_until.
-template <typename T>
-struct is_match_condition
-{
-#if defined(GENERATING_DOCUMENTATION)
-  /// The value member is true if the type may be used as a match condition.
-  static const bool value;
-#else
-  enum
-  {
-    value = asio::is_function<
-        typename asio::remove_pointer<T>::type>::value
-      || detail::has_result_type<T>::value
-  };
-#endif
-};
-
-/**
- * @defgroup read_until asio::read_until
- *
- * @brief Read data into a dynamic buffer sequence, or into a streambuf, until
- * it contains a delimiter, matches a regular expression, or a function object
- * indicates a match.
- */
-/*@{*/
-
-/// Read data into a dynamic buffer sequence until it contains a specified
-/// delimiter.
-/**
- * This function is used to read data into the specified dynamic buffer
- * sequence until the dynamic buffer sequence's get area contains the specified
- * delimiter. The call will block until one of the following conditions is
- * true:
- *
- * @li The get area of the dynamic buffer sequence contains the specified
- * delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the dynamic buffer sequence's get area already
- * contains the delimiter, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param buffers The dynamic buffer sequence into which the data will be read.
- *
- * @param delim The delimiter character.
- *
- * @returns The number of bytes in the dynamic buffer sequence's get area up to
- * and including the delimiter.
- *
- * @throws asio::system_error Thrown on failure.
- *
- * @note After a successful read_until operation, the dynamic buffer sequence
- * may contain additional data beyond the delimiter. An application will
- * typically leave that data in the dynamic buffer sequence for a subsequent
- * read_until operation to examine.
- *
- * @par Example
- * To read data into a @c std::string until a newline is encountered:
- * @code std::string data;
- * std::string n = asio::read_until(s,
- *     asio::dynamic_buffer(data), '\n');
- * std::string line = data.substr(0, n);
- * data.erase(0, n); @endcode
- * After the @c read_until operation completes successfully, the string @c data
- * contains the delimiter:
- * @code { 'a', 'b', ..., 'c', '\n', 'd', 'e', ... } @endcode
- * The call to @c substr then extracts the data up to and including the
- * delimiter, so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\n' } @endcode
- * After the call to @c erase, the remaining data is left in the buffer @c b as
- * follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c read_until operation.
- */
-template <typename SyncReadStream, typename DynamicBuffer>
-std::size_t read_until(SyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers, char delim);
-
-/// Read data into a dynamic buffer sequence until it contains a specified
-/// delimiter.
-/**
- * This function is used to read data into the specified dynamic buffer
- * sequence until the dynamic buffer sequence's get area contains the specified
- * delimiter. The call will block until one of the following conditions is
- * true:
- *
- * @li The get area of the dynamic buffer sequence contains the specified
- * delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the dynamic buffer sequence's get area already
- * contains the delimiter, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param buffers The dynamic buffer sequence into which the data will be read.
- *
- * @param delim The delimiter character.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes in the dynamic buffer sequence's get area up to
- * and including the delimiter. Returns 0 if an error occurred.
- *
- * @note After a successful read_until operation, the dynamic buffer sequence
- * may contain additional data beyond the delimiter. An application will
- * typically leave that data in the dynamic buffer sequence for a subsequent
- * read_until operation to examine.
- */
-template <typename SyncReadStream, typename DynamicBuffer>
-std::size_t read_until(SyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    char delim, asio::error_code& ec);
-
-/// Read data into a dynamic buffer sequence until it contains a specified
-/// delimiter.
-/**
- * This function is used to read data into the specified dynamic buffer
- * sequence until the dynamic buffer sequence's get area contains the specified
- * delimiter. The call will block until one of the following conditions is
- * true:
- *
- * @li The get area of the dynamic buffer sequence contains the specified
- * delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the dynamic buffer sequence's get area already
- * contains the delimiter, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param buffers The dynamic buffer sequence into which the data will be read.
- *
- * @param delim The delimiter string.
- *
- * @returns The number of bytes in the dynamic buffer sequence's get area up to
- * and including the delimiter.
- *
- * @note After a successful read_until operation, the dynamic buffer sequence
- * may contain additional data beyond the delimiter. An application will
- * typically leave that data in the dynamic buffer sequence for a subsequent
- * read_until operation to examine.
- *
- * @par Example
- * To read data into a @c std::string until a CR-LF sequence is encountered:
- * @code std::string data;
- * std::string n = asio::read_until(s,
- *     asio::dynamic_buffer(data), "\r\n");
- * std::string line = data.substr(0, n);
- * data.erase(0, n); @endcode
- * After the @c read_until operation completes successfully, the string @c data
- * contains the delimiter:
- * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
- * The call to @c substr then extracts the data up to and including the
- * delimiter, so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\r', '\n' } @endcode
- * After the call to @c erase, the remaining data is left in the buffer @c b as
- * follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c read_until operation.
- */
-template <typename SyncReadStream, typename DynamicBuffer>
-std::size_t read_until(SyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    ASIO_STRING_VIEW_PARAM delim);
-
-/// Read data into a dynamic buffer sequence until it contains a specified
-/// delimiter.
-/**
- * This function is used to read data into the specified dynamic buffer
- * sequence until the dynamic buffer sequence's get area contains the specified
- * delimiter. The call will block until one of the following conditions is
- * true:
- *
- * @li The get area of the dynamic buffer sequence contains the specified
- * delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the dynamic buffer sequence's get area already
- * contains the delimiter, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param buffers The dynamic buffer sequence into which the data will be read.
- *
- * @param delim The delimiter string.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes in the dynamic buffer sequence's get area up to
- * and including the delimiter. Returns 0 if an error occurred.
- *
- * @note After a successful read_until operation, the dynamic buffer sequence
- * may contain additional data beyond the delimiter. An application will
- * typically leave that data in the dynamic buffer sequence for a subsequent
- * read_until operation to examine.
- */
-template <typename SyncReadStream, typename DynamicBuffer>
-std::size_t read_until(SyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    ASIO_STRING_VIEW_PARAM delim,
-    asio::error_code& ec);
-
-#if !defined(ASIO_NO_EXTENSIONS)
-#if defined(ASIO_HAS_BOOST_REGEX) \
-  || defined(GENERATING_DOCUMENTATION)
-
-/// Read data into a dynamic buffer sequence until some part of the data it
-/// contains matches a regular expression.
-/**
- * This function is used to read data into the specified dynamic buffer
- * sequence until the dynamic buffer sequence's get area contains some data
- * that matches a regular expression. The call will block until one of the
- * following conditions is true:
- *
- * @li A substring of the dynamic buffer sequence's get area matches the
- * regular expression.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the dynamic buffer sequence's get area already
- * contains data that matches the regular expression, the function returns
- * immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param buffers A dynamic buffer sequence into which the data will be read.
- *
- * @param expr The regular expression.
- *
- * @returns The number of bytes in the dynamic buffer sequence's get area up to
- * and including the substring that matches the regular expression.
- *
- * @throws asio::system_error Thrown on failure.
- *
- * @note After a successful read_until operation, the dynamic buffer sequence
- * may contain additional data beyond that which matched the regular
- * expression. An application will typically leave that data in the dynamic
- * buffer sequence for a subsequent read_until operation to examine.
- *
- * @par Example
- * To read data into a @c std::string until a CR-LF sequence is encountered:
- * @code std::string data;
- * std::string n = asio::read_until(s,
- *     asio::dynamic_buffer(data), boost::regex("\r\n"));
- * std::string line = data.substr(0, n);
- * data.erase(0, n); @endcode
- * After the @c read_until operation completes successfully, the string @c data
- * contains the delimiter:
- * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
- * The call to @c substr then extracts the data up to and including the
- * delimiter, so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\r', '\n' } @endcode
- * After the call to @c erase, the remaining data is left in the buffer @c b as
- * follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c read_until operation.
- */
-template <typename SyncReadStream, typename DynamicBuffer>
-std::size_t read_until(SyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    const boost::regex& expr);
-
-/// Read data into a dynamic buffer sequence until some part of the data it
-/// contains matches a regular expression.
-/**
- * This function is used to read data into the specified dynamic buffer
- * sequence until the dynamic buffer sequence's get area contains some data
- * that matches a regular expression. The call will block until one of the
- * following conditions is true:
- *
- * @li A substring of the dynamic buffer sequence's get area matches the
- * regular expression.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the dynamic buffer sequence's get area already
- * contains data that matches the regular expression, the function returns
- * immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param buffers A dynamic buffer sequence into which the data will be read.
- *
- * @param expr The regular expression.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes in the dynamic buffer sequence's get area up to
- * and including the substring that matches the regular expression. Returns 0
- * if an error occurred.
- *
- * @note After a successful read_until operation, the dynamic buffer sequence
- * may contain additional data beyond that which matched the regular
- * expression. An application will typically leave that data in the dynamic
- * buffer sequence for a subsequent read_until operation to examine.
- */
-template <typename SyncReadStream, typename DynamicBuffer>
-std::size_t read_until(SyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    const boost::regex& expr, asio::error_code& ec);
-
-#endif // defined(ASIO_HAS_BOOST_REGEX)
-       // || defined(GENERATING_DOCUMENTATION)
-
-/// Read data into a dynamic buffer sequence until a function object indicates a
-/// match.
-
-/**
- * This function is used to read data into the specified dynamic buffer
- * sequence until a user-defined match condition function object, when applied
- * to the data contained in the dynamic buffer sequence, indicates a successful
- * match. The call will block until one of the following conditions is true:
- *
- * @li The match condition function object returns a std::pair where the second
- * element evaluates to true.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the match condition function object already indicates
- * a match, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param buffers A dynamic buffer sequence into which the data will be read.
- *
- * @param match_condition The function object to be called to determine whether
- * a match exists. The signature of the function object must be:
- * @code pair<iterator, bool> match_condition(iterator begin, iterator end);
- * @endcode
- * where @c iterator represents the type:
- * @code buffers_iterator<typename DynamicBuffer::const_buffers_type>
- * @endcode
- * The iterator parameters @c begin and @c end define the range of bytes to be
- * scanned to determine whether there is a match. The @c first member of the
- * return value is an iterator marking one-past-the-end of the bytes that have
- * been consumed by the match function. This iterator is used to calculate the
- * @c begin parameter for any subsequent invocation of the match condition. The
- * @c second member of the return value is true if a match has been found, false
- * otherwise.
- *
- * @returns The number of bytes in the dynamic_buffer's get area that
- * have been fully consumed by the match function.
- *
- * @throws asio::system_error Thrown on failure.
- *
- * @note After a successful read_until operation, the dynamic buffer sequence
- * may contain additional data beyond that which matched the function object.
- * An application will typically leave that data in the dynamic buffer sequence
- * for a subsequent read_until operation to examine.
-
- * @note The default implementation of the @c is_match_condition type trait
- * evaluates to true for function pointers and function objects with a
- * @c result_type typedef. It must be specialised for other user-defined
- * function objects.
- *
- * @par Examples
- * To read data into a dynamic buffer sequence until whitespace is encountered:
- * @code typedef asio::buffers_iterator<
- *     asio::const_buffers_1> iterator;
- *
- * std::pair<iterator, bool>
- * match_whitespace(iterator begin, iterator end)
- * {
- *   iterator i = begin;
- *   while (i != end)
- *     if (std::isspace(*i++))
- *       return std::make_pair(i, true);
- *   return std::make_pair(i, false);
- * }
- * ...
- * std::string data;
- * asio::read_until(s, data, match_whitespace);
- * @endcode
- *
- * To read data into a @c std::string until a matching character is found:
- * @code class match_char
- * {
- * public:
- *   explicit match_char(char c) : c_(c) {}
- *
- *   template <typename Iterator>
- *   std::pair<Iterator, bool> operator()(
- *       Iterator begin, Iterator end) const
- *   {
- *     Iterator i = begin;
- *     while (i != end)
- *       if (c_ == *i++)
- *         return std::make_pair(i, true);
- *     return std::make_pair(i, false);
- *   }
- *
- * private:
- *   char c_;
- * };
- *
- * namespace asio {
- *   template <> struct is_match_condition<match_char>
- *     : public boost::true_type {};
- * } // namespace asio
- * ...
- * std::string data;
- * asio::read_until(s, data, match_char('a'));
- * @endcode
- */
-template <typename SyncReadStream,
-    typename DynamicBuffer, typename MatchCondition>
-std::size_t read_until(SyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    MatchCondition match_condition,
-    typename enable_if<is_match_condition<MatchCondition>::value>::type* = 0);
-
-/// Read data into a dynamic buffer sequence until a function object indicates a
-/// match.
-/**
- * This function is used to read data into the specified dynamic buffer
- * sequence until a user-defined match condition function object, when applied
- * to the data contained in the dynamic buffer sequence, indicates a successful
- * match. The call will block until one of the following conditions is true:
- *
- * @li The match condition function object returns a std::pair where the second
- * element evaluates to true.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the match condition function object already indicates
- * a match, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param buffers A dynamic buffer sequence into which the data will be read.
- *
- * @param match_condition The function object to be called to determine whether
- * a match exists. The signature of the function object must be:
- * @code pair<iterator, bool> match_condition(iterator begin, iterator end);
- * @endcode
- * where @c iterator represents the type:
- * @code buffers_iterator<DynamicBuffer::const_buffers_type>
- * @endcode
- * The iterator parameters @c begin and @c end define the range of bytes to be
- * scanned to determine whether there is a match. The @c first member of the
- * return value is an iterator marking one-past-the-end of the bytes that have
- * been consumed by the match function. This iterator is used to calculate the
- * @c begin parameter for any subsequent invocation of the match condition. The
- * @c second member of the return value is true if a match has been found, false
- * otherwise.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes in the dynamic buffer sequence's get area that
- * have been fully consumed by the match function. Returns 0 if an error
- * occurred.
- *
- * @note After a successful read_until operation, the dynamic buffer sequence
- * may contain additional data beyond that which matched the function object.
- * An application will typically leave that data in the dynamic buffer sequence
- * for a subsequent read_until operation to examine.
- *
- * @note The default implementation of the @c is_match_condition type trait
- * evaluates to true for function pointers and function objects with a
- * @c result_type typedef. It must be specialised for other user-defined
- * function objects.
- */
-template <typename SyncReadStream,
-    typename DynamicBuffer, typename MatchCondition>
-std::size_t read_until(SyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    MatchCondition match_condition, asio::error_code& ec,
-    typename enable_if<is_match_condition<MatchCondition>::value>::type* = 0);
-
-#if !defined(ASIO_NO_IOSTREAM)
-
-/// Read data into a streambuf until it contains a specified delimiter.
-/**
- * This function is used to read data into the specified streambuf until the
- * streambuf's get area contains the specified delimiter. The call will block
- * until one of the following conditions is true:
- *
- * @li The get area of the streambuf contains the specified delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the streambuf's get area already contains the
- * delimiter, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read.
- *
- * @param delim The delimiter character.
- *
- * @returns The number of bytes in the streambuf's get area up to and including
- * the delimiter.
- *
- * @throws asio::system_error Thrown on failure.
- *
- * @note After a successful read_until operation, the streambuf may contain
- * additional data beyond the delimiter. An application will typically leave
- * that data in the streambuf for a subsequent read_until operation to examine.
- *
- * @par Example
- * To read data into a streambuf until a newline is encountered:
- * @code asio::streambuf b;
- * asio::read_until(s, b, '\n');
- * std::istream is(&b);
- * std::string line;
- * std::getline(is, line); @endcode
- * After the @c read_until operation completes successfully, the buffer @c b
- * contains the delimiter:
- * @code { 'a', 'b', ..., 'c', '\n', 'd', 'e', ... } @endcode
- * The call to @c std::getline then extracts the data up to and including the
- * newline (which is discarded), so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c' } @endcode
- * The remaining data is left in the buffer @c b as follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c read_until operation.
- */
-template <typename SyncReadStream, typename Allocator>
-std::size_t read_until(SyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b, char delim);
-
-/// Read data into a streambuf until it contains a specified delimiter.
-/**
- * This function is used to read data into the specified streambuf until the
- * streambuf's get area contains the specified delimiter. The call will block
- * until one of the following conditions is true:
- *
- * @li The get area of the streambuf contains the specified delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the streambuf's get area already contains the
- * delimiter, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read.
- *
- * @param delim The delimiter character.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes in the streambuf's get area up to and including
- * the delimiter. Returns 0 if an error occurred.
- *
- * @note After a successful read_until operation, the streambuf may contain
- * additional data beyond the delimiter. An application will typically leave
- * that data in the streambuf for a subsequent read_until operation to examine.
- */
-template <typename SyncReadStream, typename Allocator>
-std::size_t read_until(SyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b, char delim,
-    asio::error_code& ec);
-
-/// Read data into a streambuf until it contains a specified delimiter.
-/**
- * This function is used to read data into the specified streambuf until the
- * streambuf's get area contains the specified delimiter. The call will block
- * until one of the following conditions is true:
- *
- * @li The get area of the streambuf contains the specified delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the streambuf's get area already contains the
- * delimiter, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read.
- *
- * @param delim The delimiter string.
- *
- * @returns The number of bytes in the streambuf's get area up to and including
- * the delimiter.
- *
- * @throws asio::system_error Thrown on failure.
- *
- * @note After a successful read_until operation, the streambuf may contain
- * additional data beyond the delimiter. An application will typically leave
- * that data in the streambuf for a subsequent read_until operation to examine.
- *
- * @par Example
- * To read data into a streambuf until a newline is encountered:
- * @code asio::streambuf b;
- * asio::read_until(s, b, "\r\n");
- * std::istream is(&b);
- * std::string line;
- * std::getline(is, line); @endcode
- * After the @c read_until operation completes successfully, the buffer @c b
- * contains the delimiter:
- * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
- * The call to @c std::getline then extracts the data up to and including the
- * newline (which is discarded), so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\r' } @endcode
- * The remaining data is left in the buffer @c b as follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c read_until operation.
- */
-template <typename SyncReadStream, typename Allocator>
-std::size_t read_until(SyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b,
-    ASIO_STRING_VIEW_PARAM delim);
-
-/// Read data into a streambuf until it contains a specified delimiter.
-/**
- * This function is used to read data into the specified streambuf until the
- * streambuf's get area contains the specified delimiter. The call will block
- * until one of the following conditions is true:
- *
- * @li The get area of the streambuf contains the specified delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the streambuf's get area already contains the
- * delimiter, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read.
- *
- * @param delim The delimiter string.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes in the streambuf's get area up to and including
- * the delimiter. Returns 0 if an error occurred.
- *
- * @note After a successful read_until operation, the streambuf may contain
- * additional data beyond the delimiter. An application will typically leave
- * that data in the streambuf for a subsequent read_until operation to examine.
- */
-template <typename SyncReadStream, typename Allocator>
-std::size_t read_until(SyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b,
-    ASIO_STRING_VIEW_PARAM delim, asio::error_code& ec);
-
-#if defined(ASIO_HAS_BOOST_REGEX) \
-  || defined(GENERATING_DOCUMENTATION)
-
-/// Read data into a streambuf until some part of the data it contains matches
-/// a regular expression.
-/**
- * This function is used to read data into the specified streambuf until the
- * streambuf's get area contains some data that matches a regular expression.
- * The call will block until one of the following conditions is true:
- *
- * @li A substring of the streambuf's get area matches the regular expression.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the streambuf's get area already contains data that
- * matches the regular expression, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read.
- *
- * @param expr The regular expression.
- *
- * @returns The number of bytes in the streambuf's get area up to and including
- * the substring that matches the regular expression.
- *
- * @throws asio::system_error Thrown on failure.
- *
- * @note After a successful read_until operation, the streambuf may contain
- * additional data beyond that which matched the regular expression. An
- * application will typically leave that data in the streambuf for a subsequent
- * read_until operation to examine.
- *
- * @par Example
- * To read data into a streambuf until a CR-LF sequence is encountered:
- * @code asio::streambuf b;
- * asio::read_until(s, b, boost::regex("\r\n"));
- * std::istream is(&b);
- * std::string line;
- * std::getline(is, line); @endcode
- * After the @c read_until operation completes successfully, the buffer @c b
- * contains the data which matched the regular expression:
- * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
- * The call to @c std::getline then extracts the data up to and including the
- * newline (which is discarded), so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\r' } @endcode
- * The remaining data is left in the buffer @c b as follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c read_until operation.
- */
-template <typename SyncReadStream, typename Allocator>
-std::size_t read_until(SyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b, const boost::regex& expr);
-
-/// Read data into a streambuf until some part of the data it contains matches
-/// a regular expression.
-/**
- * This function is used to read data into the specified streambuf until the
- * streambuf's get area contains some data that matches a regular expression.
- * The call will block until one of the following conditions is true:
- *
- * @li A substring of the streambuf's get area matches the regular expression.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the streambuf's get area already contains data that
- * matches the regular expression, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read.
- *
- * @param expr The regular expression.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes in the streambuf's get area up to and including
- * the substring that matches the regular expression. Returns 0 if an error
- * occurred.
- *
- * @note After a successful read_until operation, the streambuf may contain
- * additional data beyond that which matched the regular expression. An
- * application will typically leave that data in the streambuf for a subsequent
- * read_until operation to examine.
- */
-template <typename SyncReadStream, typename Allocator>
-std::size_t read_until(SyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
-    asio::error_code& ec);
-
-#endif // defined(ASIO_HAS_BOOST_REGEX)
-       // || defined(GENERATING_DOCUMENTATION)
-
-/// Read data into a streambuf until a function object indicates a match.
-/**
- * This function is used to read data into the specified streambuf until a
- * user-defined match condition function object, when applied to the data
- * contained in the streambuf, indicates a successful match. The call will
- * block until one of the following conditions is true:
- *
- * @li The match condition function object returns a std::pair where the second
- * element evaluates to true.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the match condition function object already indicates
- * a match, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read.
- *
- * @param match_condition The function object to be called to determine whether
- * a match exists. The signature of the function object must be:
- * @code pair<iterator, bool> match_condition(iterator begin, iterator end);
- * @endcode
- * where @c iterator represents the type:
- * @code buffers_iterator<basic_streambuf<Allocator>::const_buffers_type>
- * @endcode
- * The iterator parameters @c begin and @c end define the range of bytes to be
- * scanned to determine whether there is a match. The @c first member of the
- * return value is an iterator marking one-past-the-end of the bytes that have
- * been consumed by the match function. This iterator is used to calculate the
- * @c begin parameter for any subsequent invocation of the match condition. The
- * @c second member of the return value is true if a match has been found, false
- * otherwise.
- *
- * @returns The number of bytes in the streambuf's get area that have been fully
- * consumed by the match function.
- *
- * @throws asio::system_error Thrown on failure.
- *
- * @note After a successful read_until operation, the streambuf may contain
- * additional data beyond that which matched the function object. An application
- * will typically leave that data in the streambuf for a subsequent read_until
- * operation to examine.
- *
- * @note The default implementation of the @c is_match_condition type trait
- * evaluates to true for function pointers and function objects with a
- * @c result_type typedef. It must be specialised for other user-defined
- * function objects.
- *
- * @par Examples
- * To read data into a streambuf until whitespace is encountered:
- * @code typedef asio::buffers_iterator<
- *     asio::streambuf::const_buffers_type> iterator;
- *
- * std::pair<iterator, bool>
- * match_whitespace(iterator begin, iterator end)
- * {
- *   iterator i = begin;
- *   while (i != end)
- *     if (std::isspace(*i++))
- *       return std::make_pair(i, true);
- *   return std::make_pair(i, false);
- * }
- * ...
- * asio::streambuf b;
- * asio::read_until(s, b, match_whitespace);
- * @endcode
- *
- * To read data into a streambuf until a matching character is found:
- * @code class match_char
- * {
- * public:
- *   explicit match_char(char c) : c_(c) {}
- *
- *   template <typename Iterator>
- *   std::pair<Iterator, bool> operator()(
- *       Iterator begin, Iterator end) const
- *   {
- *     Iterator i = begin;
- *     while (i != end)
- *       if (c_ == *i++)
- *         return std::make_pair(i, true);
- *     return std::make_pair(i, false);
- *   }
- *
- * private:
- *   char c_;
- * };
- *
- * namespace asio {
- *   template <> struct is_match_condition<match_char>
- *     : public boost::true_type {};
- * } // namespace asio
- * ...
- * asio::streambuf b;
- * asio::read_until(s, b, match_char('a'));
- * @endcode
- */
-template <typename SyncReadStream, typename Allocator, typename MatchCondition>
-std::size_t read_until(SyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b, MatchCondition match_condition,
-    typename enable_if<is_match_condition<MatchCondition>::value>::type* = 0);
-
-/// Read data into a streambuf until a function object indicates a match.
-/**
- * This function is used to read data into the specified streambuf until a
- * user-defined match condition function object, when applied to the data
- * contained in the streambuf, indicates a successful match. The call will
- * block until one of the following conditions is true:
- *
- * @li The match condition function object returns a std::pair where the second
- * element evaluates to true.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * read_some function. If the match condition function object already indicates
- * a match, the function returns immediately.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the SyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read.
- *
- * @param match_condition The function object to be called to determine whether
- * a match exists. The signature of the function object must be:
- * @code pair<iterator, bool> match_condition(iterator begin, iterator end);
- * @endcode
- * where @c iterator represents the type:
- * @code buffers_iterator<basic_streambuf<Allocator>::const_buffers_type>
- * @endcode
- * The iterator parameters @c begin and @c end define the range of bytes to be
- * scanned to determine whether there is a match. The @c first member of the
- * return value is an iterator marking one-past-the-end of the bytes that have
- * been consumed by the match function. This iterator is used to calculate the
- * @c begin parameter for any subsequent invocation of the match condition. The
- * @c second member of the return value is true if a match has been found, false
- * otherwise.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes in the streambuf's get area that have been fully
- * consumed by the match function. Returns 0 if an error occurred.
- *
- * @note After a successful read_until operation, the streambuf may contain
- * additional data beyond that which matched the function object. An application
- * will typically leave that data in the streambuf for a subsequent read_until
- * operation to examine.
- *
- * @note The default implementation of the @c is_match_condition type trait
- * evaluates to true for function pointers and function objects with a
- * @c result_type typedef. It must be specialised for other user-defined
- * function objects.
- */
-template <typename SyncReadStream, typename Allocator, typename MatchCondition>
-std::size_t read_until(SyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b,
-    MatchCondition match_condition, asio::error_code& ec,
-    typename enable_if<is_match_condition<MatchCondition>::value>::type* = 0);
-
-#endif // !defined(ASIO_NO_IOSTREAM)
-#endif // !defined(ASIO_NO_EXTENSIONS)
-
-/*@}*/
-/**
- * @defgroup async_read_until asio::async_read_until
- *
- * @brief Start an asynchronous operation to read data into a dynamic buffer
- * sequence, or into a streambuf, until it contains a delimiter, matches a
- * regular expression, or a function object indicates a match.
- */
-/*@{*/
-
-/// Start an asynchronous operation to read data into a dynamic buffer sequence
-/// until it contains a specified delimiter.
-/**
- * This function is used to asynchronously read data into the specified dynamic
- * buffer sequence until the dynamic buffer sequence's get area contains the
- * specified delimiter. The function call always returns immediately. The
- * asynchronous operation will continue until one of the following conditions
- * is true:
- *
- * @li The get area of the dynamic buffer sequence contains the specified
- * delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * async_read_some function, and is known as a <em>composed operation</em>. If
- * the dynamic buffer sequence's get area already contains the delimiter, this
- * asynchronous operation completes immediately. The program must ensure that
- * the stream performs no other read operations (such as async_read,
- * async_read_until, the stream's async_read_some function, or any other
- * composed operations that perform reads) until this operation completes.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the AsyncReadStream concept.
- *
- * @param buffers The dynamic buffer sequence into which the data will be read.
- * Although the buffers object may be copied as necessary, ownership of the
- * underlying memory blocks is retained by the caller, which must guarantee
- * that they remain valid until the handler is called.
- *
- * @param delim The delimiter character.
- *
- * @param handler The handler to be called when the read operation completes.
- * Copies will be made of the handler as required. The function signature of the
- * handler must be:
- * @code void handler(
- *   // Result of operation.
- *   const asio::error_code& error,
- *
- *   // The number of bytes in the dynamic buffer sequence's
- *   // get area up to and including the delimiter.
- *   // 0 if an error occurred.
- *   std::size_t bytes_transferred
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation of
- * the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note After a successful async_read_until operation, the dynamic buffer
- * sequence may contain additional data beyond the delimiter. An application
- * will typically leave that data in the dynamic buffer sequence for a
- * subsequent async_read_until operation to examine.
- *
- * @par Example
- * To asynchronously read data into a @c std::string until a newline is
- * encountered:
- * @code std::string data;
- * ...
- * void handler(const asio::error_code& e, std::size_t size)
- * {
- *   if (!e)
- *   {
- *     std::string line = data.substr(0, n);
- *     data.erase(0, n);
- *     ...
- *   }
- * }
- * ...
- * asio::async_read_until(s, data, '\n', handler); @endcode
- * After the @c async_read_until operation completes successfully, the buffer
- * @c data contains the delimiter:
- * @code { 'a', 'b', ..., 'c', '\n', 'd', 'e', ... } @endcode
- * The call to @c substr then extracts the data up to and including the
- * delimiter, so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\n' } @endcode
- * After the call to @c erase, the remaining data is left in the buffer @c data
- * as follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c async_read_until operation.
- */
-template <typename AsyncReadStream,
-    typename DynamicBuffer, typename ReadHandler>
-ASIO_INITFN_RESULT_TYPE(ReadHandler,
-    void (asio::error_code, std::size_t))
-async_read_until(AsyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    char delim, ASIO_MOVE_ARG(ReadHandler) handler);
-
-/// Start an asynchronous operation to read data into a dynamic buffer sequence
-/// until it contains a specified delimiter.
-/**
- * This function is used to asynchronously read data into the specified dynamic
- * buffer sequence until the dynamic buffer sequence's get area contains the
- * specified delimiter. The function call always returns immediately. The
- * asynchronous operation will continue until one of the following conditions
- * is true:
- *
- * @li The get area of the dynamic buffer sequence contains the specified
- * delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * async_read_some function, and is known as a <em>composed operation</em>. If
- * the dynamic buffer sequence's get area already contains the delimiter, this
- * asynchronous operation completes immediately. The program must ensure that
- * the stream performs no other read operations (such as async_read,
- * async_read_until, the stream's async_read_some function, or any other
- * composed operations that perform reads) until this operation completes.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the AsyncReadStream concept.
- *
- * @param buffers The dynamic buffer sequence into which the data will be read.
- * Although the buffers object may be copied as necessary, ownership of the
- * underlying memory blocks is retained by the caller, which must guarantee
- * that they remain valid until the handler is called.
- *
- * @param delim The delimiter string.
- *
- * @param handler The handler to be called when the read operation completes.
- * Copies will be made of the handler as required. The function signature of the
- * handler must be:
- * @code void handler(
- *   // Result of operation.
- *   const asio::error_code& error,
- *
- *   // The number of bytes in the dynamic buffer sequence's
- *   // get area up to and including the delimiter.
- *   // 0 if an error occurred.
- *   std::size_t bytes_transferred
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation of
- * the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note After a successful async_read_until operation, the dynamic buffer
- * sequence may contain additional data beyond the delimiter. An application
- * will typically leave that data in the dynamic buffer sequence for a
- * subsequent async_read_until operation to examine.
- *
- * @par Example
- * To asynchronously read data into a @c std::string until a CR-LF sequence is
- * encountered:
- * @code std::string data;
- * ...
- * void handler(const asio::error_code& e, std::size_t size)
- * {
- *   if (!e)
- *   {
- *     std::string line = data.substr(0, n);
- *     data.erase(0, n);
- *     ...
- *   }
- * }
- * ...
- * asio::async_read_until(s, data, "\r\n", handler); @endcode
- * After the @c async_read_until operation completes successfully, the string
- * @c data contains the delimiter:
- * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
- * The call to @c substr then extracts the data up to and including the
- * delimiter, so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\r', '\n' } @endcode
- * After the call to @c erase, the remaining data is left in the string @c data
- * as follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c async_read_until operation.
- */
-template <typename AsyncReadStream,
-    typename DynamicBuffer, typename ReadHandler>
-ASIO_INITFN_RESULT_TYPE(ReadHandler,
-    void (asio::error_code, std::size_t))
-async_read_until(AsyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    ASIO_STRING_VIEW_PARAM delim,
-    ASIO_MOVE_ARG(ReadHandler) handler);
-
-#if !defined(ASIO_NO_EXTENSIONS)
-#if defined(ASIO_HAS_BOOST_REGEX) \
-  || defined(GENERATING_DOCUMENTATION)
-
-/// Start an asynchronous operation to read data into a dynamic buffer sequence
-/// until some part of its data matches a regular expression.
-/**
- * This function is used to asynchronously read data into the specified dynamic
- * buffer sequence until the dynamic buffer sequence's get area contains some
- * data that matches a regular expression. The function call always returns
- * immediately. The asynchronous operation will continue until one of the
- * following conditions is true:
- *
- * @li A substring of the dynamic buffer sequence's get area matches the regular
- * expression.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * async_read_some function, and is known as a <em>composed operation</em>. If
- * the dynamic buffer sequence's get area already contains data that matches
- * the regular expression, this asynchronous operation completes immediately.
- * The program must ensure that the stream performs no other read operations
- * (such as async_read, async_read_until, the stream's async_read_some
- * function, or any other composed operations that perform reads) until this
- * operation completes.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the AsyncReadStream concept.
- *
- * @param buffers The dynamic buffer sequence into which the data will be read.
- * Although the buffers object may be copied as necessary, ownership of the
- * underlying memory blocks is retained by the caller, which must guarantee
- * that they remain valid until the handler is called.
- *
- * @param expr The regular expression.
- *
- * @param handler The handler to be called when the read operation completes.
- * Copies will be made of the handler as required. The function signature of the
- * handler must be:
- * @code void handler(
- *   // Result of operation.
- *   const asio::error_code& error,
- *
- *   // The number of bytes in the dynamic buffer
- *   // sequence's get area up to and including the
- *   // substring that matches the regular expression.
- *   // 0 if an error occurred.
- *   std::size_t bytes_transferred
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation of
- * the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note After a successful async_read_until operation, the dynamic buffer
- * sequence may contain additional data beyond that which matched the regular
- * expression. An application will typically leave that data in the dynamic
- * buffer sequence for a subsequent async_read_until operation to examine.
- *
- * @par Example
- * To asynchronously read data into a @c std::string until a CR-LF sequence is
- * encountered:
- * @code std::string data;
- * ...
- * void handler(const asio::error_code& e, std::size_t size)
- * {
- *   if (!e)
- *   {
- *     std::string line = data.substr(0, n);
- *     data.erase(0, n);
- *     ...
- *   }
- * }
- * ...
- * asio::async_read_until(s, data,
- *     boost::regex("\r\n"), handler); @endcode
- * After the @c async_read_until operation completes successfully, the string
- * @c data contains the data which matched the regular expression:
- * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
- * The call to @c substr then extracts the data up to and including the match,
- * so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\r', '\n' } @endcode
- * After the call to @c erase, the remaining data is left in the string @c data
- * as follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c async_read_until operation.
- */
-template <typename AsyncReadStream,
-    typename DynamicBuffer, typename ReadHandler>
-ASIO_INITFN_RESULT_TYPE(ReadHandler,
-    void (asio::error_code, std::size_t))
-async_read_until(AsyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    const boost::regex& expr,
-    ASIO_MOVE_ARG(ReadHandler) handler);
-
-#endif // defined(ASIO_HAS_BOOST_REGEX)
-       // || defined(GENERATING_DOCUMENTATION)
-
-/// Start an asynchronous operation to read data into a dynamic buffer sequence
-/// until a function object indicates a match.
-/**
- * This function is used to asynchronously read data into the specified dynamic
- * buffer sequence until a user-defined match condition function object, when
- * applied to the data contained in the dynamic buffer sequence, indicates a
- * successful match. The function call always returns immediately. The
- * asynchronous operation will continue until one of the following conditions
- * is true:
- *
- * @li The match condition function object returns a std::pair where the second
- * element evaluates to true.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * async_read_some function, and is known as a <em>composed operation</em>. If
- * the match condition function object already indicates a match, this
- * asynchronous operation completes immediately. The program must ensure that
- * the stream performs no other read operations (such as async_read,
- * async_read_until, the stream's async_read_some function, or any other
- * composed operations that perform reads) until this operation completes.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the AsyncReadStream concept.
- *
- * @param buffers The dynamic buffer sequence into which the data will be read.
- * Although the buffers object may be copied as necessary, ownership of the
- * underlying memory blocks is retained by the caller, which must guarantee
- * that they remain valid until the handler is called.
- *
- * @param match_condition The function object to be called to determine whether
- * a match exists. The signature of the function object must be:
- * @code pair<iterator, bool> match_condition(iterator begin, iterator end);
- * @endcode
- * where @c iterator represents the type:
- * @code buffers_iterator<typename DynamicBuffer::const_buffers_type>
- * @endcode
- * The iterator parameters @c begin and @c end define the range of bytes to be
- * scanned to determine whether there is a match. The @c first member of the
- * return value is an iterator marking one-past-the-end of the bytes that have
- * been consumed by the match function. This iterator is used to calculate the
- * @c begin parameter for any subsequent invocation of the match condition. The
- * @c second member of the return value is true if a match has been found, false
- * otherwise.
- *
- * @param handler The handler to be called when the read operation completes.
- * Copies will be made of the handler as required. The function signature of the
- * handler must be:
- * @code void handler(
- *   // Result of operation.
- *   const asio::error_code& error,
- *
- *   // The number of bytes in the dynamic buffer sequence's
- *   // get area that have been fully consumed by the match
- *   // function. O if an error occurred.
- *   std::size_t bytes_transferred
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation of
- * the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note After a successful async_read_until operation, the dynamic buffer
- * sequence may contain additional data beyond that which matched the function
- * object. An application will typically leave that data in the dynamic buffer
- * sequence for a subsequent async_read_until operation to examine.
- *
- * @note The default implementation of the @c is_match_condition type trait
- * evaluates to true for function pointers and function objects with a
- * @c result_type typedef. It must be specialised for other user-defined
- * function objects.
- *
- * @par Examples
- * To asynchronously read data into a @c std::string until whitespace is
- * encountered:
- * @code typedef asio::buffers_iterator<
- *     asio::const_buffers_1> iterator;
- *
- * std::pair<iterator, bool>
- * match_whitespace(iterator begin, iterator end)
- * {
- *   iterator i = begin;
- *   while (i != end)
- *     if (std::isspace(*i++))
- *       return std::make_pair(i, true);
- *   return std::make_pair(i, false);
- * }
- * ...
- * void handler(const asio::error_code& e, std::size_t size);
- * ...
- * std::string data;
- * asio::async_read_until(s, data, match_whitespace, handler);
- * @endcode
- *
- * To asynchronously read data into a @c std::string until a matching character
- * is found:
- * @code class match_char
- * {
- * public:
- *   explicit match_char(char c) : c_(c) {}
- *
- *   template <typename Iterator>
- *   std::pair<Iterator, bool> operator()(
- *       Iterator begin, Iterator end) const
- *   {
- *     Iterator i = begin;
- *     while (i != end)
- *       if (c_ == *i++)
- *         return std::make_pair(i, true);
- *     return std::make_pair(i, false);
- *   }
- *
- * private:
- *   char c_;
- * };
- *
- * namespace asio {
- *   template <> struct is_match_condition<match_char>
- *     : public boost::true_type {};
- * } // namespace asio
- * ...
- * void handler(const asio::error_code& e, std::size_t size);
- * ...
- * std::string data;
- * asio::async_read_until(s, data, match_char('a'), handler);
- * @endcode
- */
-template <typename AsyncReadStream, typename DynamicBuffer,
-    typename MatchCondition, typename ReadHandler>
-ASIO_INITFN_RESULT_TYPE(ReadHandler,
-    void (asio::error_code, std::size_t))
-async_read_until(AsyncReadStream& s,
-    ASIO_MOVE_ARG(DynamicBuffer) buffers,
-    MatchCondition match_condition, ASIO_MOVE_ARG(ReadHandler) handler,
-    typename enable_if<is_match_condition<MatchCondition>::value>::type* = 0);
-
-#if !defined(ASIO_NO_IOSTREAM)
-
-/// Start an asynchronous operation to read data into a streambuf until it
-/// contains a specified delimiter.
-/**
- * This function is used to asynchronously read data into the specified
- * streambuf until the streambuf's get area contains the specified delimiter.
- * The function call always returns immediately. The asynchronous operation
- * will continue until one of the following conditions is true:
- *
- * @li The get area of the streambuf contains the specified delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * async_read_some function, and is known as a <em>composed operation</em>. If
- * the streambuf's get area already contains the delimiter, this asynchronous
- * operation completes immediately. The program must ensure that the stream
- * performs no other read operations (such as async_read, async_read_until, the
- * stream's async_read_some function, or any other composed operations that
- * perform reads) until this operation completes.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the AsyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read. Ownership of
- * the streambuf is retained by the caller, which must guarantee that it remains
- * valid until the handler is called.
- *
- * @param delim The delimiter character.
- *
- * @param handler The handler to be called when the read operation completes.
- * Copies will be made of the handler as required. The function signature of the
- * handler must be:
- * @code void handler(
- *   // Result of operation.
- *   const asio::error_code& error,
- *
- *   // The number of bytes in the streambuf's get
- *   // area up to and including the delimiter.
- *   // 0 if an error occurred.
- *   std::size_t bytes_transferred
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation of
- * the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note After a successful async_read_until operation, the streambuf may
- * contain additional data beyond the delimiter. An application will typically
- * leave that data in the streambuf for a subsequent async_read_until operation
- * to examine.
- *
- * @par Example
- * To asynchronously read data into a streambuf until a newline is encountered:
- * @code asio::streambuf b;
- * ...
- * void handler(const asio::error_code& e, std::size_t size)
- * {
- *   if (!e)
- *   {
- *     std::istream is(&b);
- *     std::string line;
- *     std::getline(is, line);
- *     ...
- *   }
- * }
- * ...
- * asio::async_read_until(s, b, '\n', handler); @endcode
- * After the @c async_read_until operation completes successfully, the buffer
- * @c b contains the delimiter:
- * @code { 'a', 'b', ..., 'c', '\n', 'd', 'e', ... } @endcode
- * The call to @c std::getline then extracts the data up to and including the
- * newline (which is discarded), so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c' } @endcode
- * The remaining data is left in the buffer @c b as follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c async_read_until operation.
- */
-template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
-ASIO_INITFN_RESULT_TYPE(ReadHandler,
-    void (asio::error_code, std::size_t))
-async_read_until(AsyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b,
-    char delim, ASIO_MOVE_ARG(ReadHandler) handler);
-
-/// Start an asynchronous operation to read data into a streambuf until it
-/// contains a specified delimiter.
-/**
- * This function is used to asynchronously read data into the specified
- * streambuf until the streambuf's get area contains the specified delimiter.
- * The function call always returns immediately. The asynchronous operation
- * will continue until one of the following conditions is true:
- *
- * @li The get area of the streambuf contains the specified delimiter.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * async_read_some function, and is known as a <em>composed operation</em>. If
- * the streambuf's get area already contains the delimiter, this asynchronous
- * operation completes immediately. The program must ensure that the stream
- * performs no other read operations (such as async_read, async_read_until, the
- * stream's async_read_some function, or any other composed operations that
- * perform reads) until this operation completes.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the AsyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read. Ownership of
- * the streambuf is retained by the caller, which must guarantee that it remains
- * valid until the handler is called.
- *
- * @param delim The delimiter string.
- *
- * @param handler The handler to be called when the read operation completes.
- * Copies will be made of the handler as required. The function signature of the
- * handler must be:
- * @code void handler(
- *   // Result of operation.
- *   const asio::error_code& error,
- *
- *   // The number of bytes in the streambuf's get
- *   // area up to and including the delimiter.
- *   // 0 if an error occurred.
- *   std::size_t bytes_transferred
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation of
- * the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note After a successful async_read_until operation, the streambuf may
- * contain additional data beyond the delimiter. An application will typically
- * leave that data in the streambuf for a subsequent async_read_until operation
- * to examine.
- *
- * @par Example
- * To asynchronously read data into a streambuf until a newline is encountered:
- * @code asio::streambuf b;
- * ...
- * void handler(const asio::error_code& e, std::size_t size)
- * {
- *   if (!e)
- *   {
- *     std::istream is(&b);
- *     std::string line;
- *     std::getline(is, line);
- *     ...
- *   }
- * }
- * ...
- * asio::async_read_until(s, b, "\r\n", handler); @endcode
- * After the @c async_read_until operation completes successfully, the buffer
- * @c b contains the delimiter:
- * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
- * The call to @c std::getline then extracts the data up to and including the
- * newline (which is discarded), so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\r' } @endcode
- * The remaining data is left in the buffer @c b as follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c async_read_until operation.
- */
-template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
-ASIO_INITFN_RESULT_TYPE(ReadHandler,
-    void (asio::error_code, std::size_t))
-async_read_until(AsyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b,
-    ASIO_STRING_VIEW_PARAM delim,
-    ASIO_MOVE_ARG(ReadHandler) handler);
-
-#if defined(ASIO_HAS_BOOST_REGEX) \
-  || defined(GENERATING_DOCUMENTATION)
-
-/// Start an asynchronous operation to read data into a streambuf until some
-/// part of its data matches a regular expression.
-/**
- * This function is used to asynchronously read data into the specified
- * streambuf until the streambuf's get area contains some data that matches a
- * regular expression. The function call always returns immediately. The
- * asynchronous operation will continue until one of the following conditions
- * is true:
- *
- * @li A substring of the streambuf's get area matches the regular expression.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * async_read_some function, and is known as a <em>composed operation</em>. If
- * the streambuf's get area already contains data that matches the regular
- * expression, this asynchronous operation completes immediately. The program
- * must ensure that the stream performs no other read operations (such as
- * async_read, async_read_until, the stream's async_read_some function, or any
- * other composed operations that perform reads) until this operation
- * completes.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the AsyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read. Ownership of
- * the streambuf is retained by the caller, which must guarantee that it remains
- * valid until the handler is called.
- *
- * @param expr The regular expression.
- *
- * @param handler The handler to be called when the read operation completes.
- * Copies will be made of the handler as required. The function signature of the
- * handler must be:
- * @code void handler(
- *   // Result of operation.
- *   const asio::error_code& error,
- *
- *   // The number of bytes in the streambuf's get
- *   // area up to and including the substring
- *   // that matches the regular. expression.
- *   // 0 if an error occurred.
- *   std::size_t bytes_transferred
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation of
- * the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note After a successful async_read_until operation, the streambuf may
- * contain additional data beyond that which matched the regular expression. An
- * application will typically leave that data in the streambuf for a subsequent
- * async_read_until operation to examine.
- *
- * @par Example
- * To asynchronously read data into a streambuf until a CR-LF sequence is
- * encountered:
- * @code asio::streambuf b;
- * ...
- * void handler(const asio::error_code& e, std::size_t size)
- * {
- *   if (!e)
- *   {
- *     std::istream is(&b);
- *     std::string line;
- *     std::getline(is, line);
- *     ...
- *   }
- * }
- * ...
- * asio::async_read_until(s, b, boost::regex("\r\n"), handler); @endcode
- * After the @c async_read_until operation completes successfully, the buffer
- * @c b contains the data which matched the regular expression:
- * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
- * The call to @c std::getline then extracts the data up to and including the
- * newline (which is discarded), so that the string @c line contains:
- * @code { 'a', 'b', ..., 'c', '\r' } @endcode
- * The remaining data is left in the buffer @c b as follows:
- * @code { 'd', 'e', ... } @endcode
- * This data may be the start of a new line, to be extracted by a subsequent
- * @c async_read_until operation.
- */
-template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
-ASIO_INITFN_RESULT_TYPE(ReadHandler,
-    void (asio::error_code, std::size_t))
-async_read_until(AsyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
-    ASIO_MOVE_ARG(ReadHandler) handler);
-
-#endif // defined(ASIO_HAS_BOOST_REGEX)
-       // || defined(GENERATING_DOCUMENTATION)
-
-/// Start an asynchronous operation to read data into a streambuf until a
-/// function object indicates a match.
-/**
- * This function is used to asynchronously read data into the specified
- * streambuf until a user-defined match condition function object, when applied
- * to the data contained in the streambuf, indicates a successful match. The
- * function call always returns immediately. The asynchronous operation will
- * continue until one of the following conditions is true:
- *
- * @li The match condition function object returns a std::pair where the second
- * element evaluates to true.
- *
- * @li An error occurred.
- *
- * This operation is implemented in terms of zero or more calls to the stream's
- * async_read_some function, and is known as a <em>composed operation</em>. If
- * the match condition function object already indicates a match, this
- * asynchronous operation completes immediately. The program must ensure that
- * the stream performs no other read operations (such as async_read,
- * async_read_until, the stream's async_read_some function, or any other
- * composed operations that perform reads) until this operation completes.
- *
- * @param s The stream from which the data is to be read. The type must support
- * the AsyncReadStream concept.
- *
- * @param b A streambuf object into which the data will be read.
- *
- * @param match_condition The function object to be called to determine whether
- * a match exists. The signature of the function object must be:
- * @code pair<iterator, bool> match_condition(iterator begin, iterator end);
- * @endcode
- * where @c iterator represents the type:
- * @code buffers_iterator<basic_streambuf<Allocator>::const_buffers_type>
- * @endcode
- * The iterator parameters @c begin and @c end define the range of bytes to be
- * scanned to determine whether there is a match. The @c first member of the
- * return value is an iterator marking one-past-the-end of the bytes that have
- * been consumed by the match function. This iterator is used to calculate the
- * @c begin parameter for any subsequent invocation of the match condition. The
- * @c second member of the return value is true if a match has been found, false
- * otherwise.
- *
- * @param handler The handler to be called when the read operation completes.
- * Copies will be made of the handler as required. The function signature of the
- * handler must be:
- * @code void handler(
- *   // Result of operation.
- *   const asio::error_code& error,
- *
- *   // The number of bytes in the streambuf's get
- *   // area that have been fully consumed by the
- *   // match function. O if an error occurred.
- *   std::size_t bytes_transferred
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation of
- * the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note After a successful async_read_until operation, the streambuf may
- * contain additional data beyond that which matched the function object. An
- * application will typically leave that data in the streambuf for a subsequent
- * async_read_until operation to examine.
- *
- * @note The default implementation of the @c is_match_condition type trait
- * evaluates to true for function pointers and function objects with a
- * @c result_type typedef. It must be specialised for other user-defined
- * function objects.
- *
- * @par Examples
- * To asynchronously read data into a streambuf until whitespace is encountered:
- * @code typedef asio::buffers_iterator<
- *     asio::streambuf::const_buffers_type> iterator;
- *
- * std::pair<iterator, bool>
- * match_whitespace(iterator begin, iterator end)
- * {
- *   iterator i = begin;
- *   while (i != end)
- *     if (std::isspace(*i++))
- *       return std::make_pair(i, true);
- *   return std::make_pair(i, false);
- * }
- * ...
- * void handler(const asio::error_code& e, std::size_t size);
- * ...
- * asio::streambuf b;
- * asio::async_read_until(s, b, match_whitespace, handler);
- * @endcode
- *
- * To asynchronously read data into a streambuf until a matching character is
- * found:
- * @code class match_char
- * {
- * public:
- *   explicit match_char(char c) : c_(c) {}
- *
- *   template <typename Iterator>
- *   std::pair<Iterator, bool> operator()(
- *       Iterator begin, Iterator end) const
- *   {
- *     Iterator i = begin;
- *     while (i != end)
- *       if (c_ == *i++)
- *         return std::make_pair(i, true);
- *     return std::make_pair(i, false);
- *   }
- *
- * private:
- *   char c_;
- * };
- *
- * namespace asio {
- *   template <> struct is_match_condition<match_char>
- *     : public boost::true_type {};
- * } // namespace asio
- * ...
- * void handler(const asio::error_code& e, std::size_t size);
- * ...
- * asio::streambuf b;
- * asio::async_read_until(s, b, match_char('a'), handler);
- * @endcode
- */
-template <typename AsyncReadStream, typename Allocator,
-    typename MatchCondition, typename ReadHandler>
-ASIO_INITFN_RESULT_TYPE(ReadHandler,
-    void (asio::error_code, std::size_t))
-async_read_until(AsyncReadStream& s,
-    asio::basic_streambuf<Allocator>& b,
-    MatchCondition match_condition, ASIO_MOVE_ARG(ReadHandler) handler,
-    typename enable_if<is_match_condition<MatchCondition>::value>::type* = 0);
-
-#endif // !defined(ASIO_NO_IOSTREAM)
-#endif // !defined(ASIO_NO_EXTENSIONS)
-
-/*@}*/
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#include "asio/impl/read_until.hpp"
-
-#endif // ASIO_READ_UNTIL_HPP