Replace boost by the standalone asio library

1 files changed, 1500 insertions, 0 deletions

diff --git a/lib/asio/impl/read_until.hpp b/lib/asio/impl/read_until.hpp
new file mode 100644
index 0000000..1f39e19
--- /dev/null
+++ b/lib/asio/impl/read_until.hpp
@@ -0,0 +1,1500 @@
+//
+// impl/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_IMPL_READ_UNTIL_HPP
+#define ASIO_IMPL_READ_UNTIL_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <algorithm>
+#include <string>
+#include <vector>
+#include <utility>
+#include "asio/associated_allocator.hpp"
+#include "asio/associated_executor.hpp"
+#include "asio/buffer.hpp"
+#include "asio/buffers_iterator.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_cont_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/handler_type_requirements.hpp"
+#include "asio/detail/limits.hpp"
+#include "asio/detail/throw_error.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+template <typename SyncReadStream, typename DynamicBuffer>
+inline std::size_t read_until(SyncReadStream& s,
+    ASIO_MOVE_ARG(DynamicBuffer) buffers, char delim)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_until(s,
+      ASIO_MOVE_CAST(DynamicBuffer)(buffers), delim, ec);
+  asio::detail::throw_error(ec, "read_until");
+  return bytes_transferred;
+}
+
+template <typename SyncReadStream, typename DynamicBuffer>
+std::size_t read_until(SyncReadStream& s,
+    ASIO_MOVE_ARG(DynamicBuffer) buffers,
+    char delim, asio::error_code& ec)
+{
+  typename decay<DynamicBuffer>::type b(
+      ASIO_MOVE_CAST(DynamicBuffer)(buffers));
+
+  std::size_t search_position = 0;
+  for (;;)
+  {
+    // Determine the range of the data to be searched.
+    typedef typename DynamicBuffer::const_buffers_type buffers_type;
+    typedef buffers_iterator<buffers_type> iterator;
+    buffers_type data_buffers = b.data();
+    iterator begin = iterator::begin(data_buffers);
+    iterator start_pos = begin + search_position;
+    iterator end = iterator::end(data_buffers);
+
+    // Look for a match.
+    iterator iter = std::find(start_pos, end, delim);
+    if (iter != end)
+    {
+      // Found a match. We're done.
+      ec = asio::error_code();
+      return iter - begin + 1;
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      search_position = end - begin;
+    }
+
+    // Check if buffer is full.
+    if (b.size() == b.max_size())
+    {
+      ec = error::not_found;
+      return 0;
+    }
+
+    // Need more data.
+    std::size_t bytes_to_read = std::min<std::size_t>(
+          std::max<std::size_t>(512, b.capacity() - b.size()),
+          std::min<std::size_t>(65536, b.max_size() - b.size()));
+    b.commit(s.read_some(b.prepare(bytes_to_read), ec));
+    if (ec)
+      return 0;
+  }
+}
+
+template <typename SyncReadStream, typename DynamicBuffer>
+inline std::size_t read_until(SyncReadStream& s,
+    ASIO_MOVE_ARG(DynamicBuffer) buffers,
+    ASIO_STRING_VIEW_PARAM delim)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_until(s,
+      ASIO_MOVE_CAST(DynamicBuffer)(buffers), delim, ec);
+  asio::detail::throw_error(ec, "read_until");
+  return bytes_transferred;
+}
+
+namespace detail
+{
+  // Algorithm that finds a subsequence of equal values in a sequence. Returns
+  // (iterator,true) if a full match was found, in which case the iterator
+  // points to the beginning of the match. Returns (iterator,false) if a
+  // partial match was found at the end of the first sequence, in which case
+  // the iterator points to the beginning of the partial match. Returns
+  // (last1,false) if no full or partial match was found.
+  template <typename Iterator1, typename Iterator2>
+  std::pair<Iterator1, bool> partial_search(
+      Iterator1 first1, Iterator1 last1, Iterator2 first2, Iterator2 last2)
+  {
+    for (Iterator1 iter1 = first1; iter1 != last1; ++iter1)
+    {
+      Iterator1 test_iter1 = iter1;
+      Iterator2 test_iter2 = first2;
+      for (;; ++test_iter1, ++test_iter2)
+      {
+        if (test_iter2 == last2)
+          return std::make_pair(iter1, true);
+        if (test_iter1 == last1)
+        {
+          if (test_iter2 != first2)
+            return std::make_pair(iter1, false);
+          else
+            break;
+        }
+        if (*test_iter1 != *test_iter2)
+          break;
+      }
+    }
+    return std::make_pair(last1, false);
+  }
+} // namespace detail
+
+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)
+{
+  typename decay<DynamicBuffer>::type b(
+      ASIO_MOVE_CAST(DynamicBuffer)(buffers));
+
+  std::size_t search_position = 0;
+  for (;;)
+  {
+    // Determine the range of the data to be searched.
+    typedef typename DynamicBuffer::const_buffers_type buffers_type;
+    typedef buffers_iterator<buffers_type> iterator;
+    buffers_type data_buffers = b.data();
+    iterator begin = iterator::begin(data_buffers);
+    iterator start_pos = begin + search_position;
+    iterator end = iterator::end(data_buffers);
+
+    // Look for a match.
+    std::pair<iterator, bool> result = detail::partial_search(
+        start_pos, end, delim.begin(), delim.end());
+    if (result.first != end)
+    {
+      if (result.second)
+      {
+        // Full match. We're done.
+        ec = asio::error_code();
+        return result.first - begin + delim.length();
+      }
+      else
+      {
+        // Partial match. Next search needs to start from beginning of match.
+        search_position = result.first - begin;
+      }
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      search_position = end - begin;
+    }
+
+    // Check if buffer is full.
+    if (b.size() == b.max_size())
+    {
+      ec = error::not_found;
+      return 0;
+    }
+
+    // Need more data.
+    std::size_t bytes_to_read = std::min<std::size_t>(
+          std::max<std::size_t>(512, b.capacity() - b.size()),
+          std::min<std::size_t>(65536, b.max_size() - b.size()));
+    b.commit(s.read_some(b.prepare(bytes_to_read), ec));
+    if (ec)
+      return 0;
+  }
+}
+
+#if !defined(ASIO_NO_EXTENSIONS)
+#if defined(ASIO_HAS_BOOST_REGEX)
+
+template <typename SyncReadStream, typename DynamicBuffer>
+inline std::size_t read_until(SyncReadStream& s,
+    ASIO_MOVE_ARG(DynamicBuffer) buffers,
+    const boost::regex& expr)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_until(s,
+      ASIO_MOVE_CAST(DynamicBuffer)(buffers), expr, ec);
+  asio::detail::throw_error(ec, "read_until");
+  return bytes_transferred;
+}
+
+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)
+{
+  typename decay<DynamicBuffer>::type b(
+      ASIO_MOVE_CAST(DynamicBuffer)(buffers));
+
+  std::size_t search_position = 0;
+  for (;;)
+  {
+    // Determine the range of the data to be searched.
+    typedef typename DynamicBuffer::const_buffers_type buffers_type;
+    typedef buffers_iterator<buffers_type> iterator;
+    buffers_type data_buffers = b.data();
+    iterator begin = iterator::begin(data_buffers);
+    iterator start_pos = begin + search_position;
+    iterator end = iterator::end(data_buffers);
+
+    // Look for a match.
+    boost::match_results<iterator,
+      typename std::vector<boost::sub_match<iterator> >::allocator_type>
+        match_results;
+    if (regex_search(start_pos, end, match_results, expr,
+          boost::match_default | boost::match_partial))
+    {
+      if (match_results[0].matched)
+      {
+        // Full match. We're done.
+        ec = asio::error_code();
+        return match_results[0].second - begin;
+      }
+      else
+      {
+        // Partial match. Next search needs to start from beginning of match.
+        search_position = match_results[0].first - begin;
+      }
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      search_position = end - begin;
+    }
+
+    // Check if buffer is full.
+    if (b.size() == b.max_size())
+    {
+      ec = error::not_found;
+      return 0;
+    }
+
+    // Need more data.
+    std::size_t bytes_to_read = read_size_helper(b, 65536);
+    b.commit(s.read_some(b.prepare(bytes_to_read), ec));
+    if (ec)
+      return 0;
+  }
+}
+
+#endif // defined(ASIO_HAS_BOOST_REGEX)
+
+template <typename SyncReadStream,
+    typename DynamicBuffer, typename MatchCondition>
+inline std::size_t read_until(SyncReadStream& s,
+    ASIO_MOVE_ARG(DynamicBuffer) buffers,
+    MatchCondition match_condition,
+    typename enable_if<is_match_condition<MatchCondition>::value>::type*)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_until(s,
+      ASIO_MOVE_CAST(DynamicBuffer)(buffers),
+      match_condition, ec);
+  asio::detail::throw_error(ec, "read_until");
+  return bytes_transferred;
+}
+
+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*)
+{
+  typename decay<DynamicBuffer>::type b(
+      ASIO_MOVE_CAST(DynamicBuffer)(buffers));
+
+  std::size_t search_position = 0;
+  for (;;)
+  {
+    // Determine the range of the data to be searched.
+    typedef typename DynamicBuffer::const_buffers_type buffers_type;
+    typedef buffers_iterator<buffers_type> iterator;
+    buffers_type data_buffers = b.data();
+    iterator begin = iterator::begin(data_buffers);
+    iterator start_pos = begin + search_position;
+    iterator end = iterator::end(data_buffers);
+
+    // Look for a match.
+    std::pair<iterator, bool> result = match_condition(start_pos, end);
+    if (result.second)
+    {
+      // Full match. We're done.
+      ec = asio::error_code();
+      return result.first - begin;
+    }
+    else if (result.first != end)
+    {
+      // Partial match. Next search needs to start from beginning of match.
+      search_position = result.first - begin;
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      search_position = end - begin;
+    }
+
+    // Check if buffer is full.
+    if (b.size() == b.max_size())
+    {
+      ec = error::not_found;
+      return 0;
+    }
+
+    // Need more data.
+    std::size_t bytes_to_read = std::min<std::size_t>(
+          std::max<std::size_t>(512, b.capacity() - b.size()),
+          std::min<std::size_t>(65536, b.max_size() - b.size()));
+    b.commit(s.read_some(b.prepare(bytes_to_read), ec));
+    if (ec)
+      return 0;
+  }
+}
+
+#if !defined(ASIO_NO_IOSTREAM)
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, char delim)
+{
+  return read_until(s, basic_streambuf_ref<Allocator>(b), delim);
+}
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, char delim,
+    asio::error_code& ec)
+{
+  return read_until(s, basic_streambuf_ref<Allocator>(b), delim, ec);
+}
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    ASIO_STRING_VIEW_PARAM delim)
+{
+  return read_until(s, basic_streambuf_ref<Allocator>(b), delim);
+}
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    ASIO_STRING_VIEW_PARAM delim, asio::error_code& ec)
+{
+  return read_until(s, basic_streambuf_ref<Allocator>(b), delim, ec);
+}
+
+#if defined(ASIO_HAS_BOOST_REGEX)
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const boost::regex& expr)
+{
+  return read_until(s, basic_streambuf_ref<Allocator>(b), expr);
+}
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
+    asio::error_code& ec)
+{
+  return read_until(s, basic_streambuf_ref<Allocator>(b), expr, ec);
+}
+
+#endif // defined(ASIO_HAS_BOOST_REGEX)
+
+template <typename SyncReadStream, typename Allocator, typename MatchCondition>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, MatchCondition match_condition,
+    typename enable_if<is_match_condition<MatchCondition>::value>::type*)
+{
+  return read_until(s, basic_streambuf_ref<Allocator>(b), match_condition);
+}
+
+template <typename SyncReadStream, typename Allocator, typename MatchCondition>
+inline 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*)
+{
+  return read_until(s, basic_streambuf_ref<Allocator>(b), match_condition, ec);
+}
+
+#endif // !defined(ASIO_NO_IOSTREAM)
+#endif // !defined(ASIO_NO_EXTENSIONS)
+
+namespace detail
+{
+  template <typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  class read_until_delim_op
+  {
+  public:
+    template <typename BufferSequence>
+    read_until_delim_op(AsyncReadStream& stream,
+        ASIO_MOVE_ARG(BufferSequence) buffers,
+        char delim, ReadHandler& handler)
+      : stream_(stream),
+        buffers_(ASIO_MOVE_CAST(BufferSequence)(buffers)),
+        delim_(delim),
+        start_(0),
+        search_position_(0),
+        handler_(ASIO_MOVE_CAST(ReadHandler)(handler))
+    {
+    }
+
+#if defined(ASIO_HAS_MOVE)
+    read_until_delim_op(const read_until_delim_op& other)
+      : stream_(other.stream_),
+        buffers_(other.buffers_),
+        delim_(other.delim_),
+        start_(other.start_),
+        search_position_(other.search_position_),
+        handler_(other.handler_)
+    {
+    }
+
+    read_until_delim_op(read_until_delim_op&& other)
+      : stream_(other.stream_),
+        buffers_(ASIO_MOVE_CAST(DynamicBuffer)(other.buffers_)),
+        delim_(other.delim_),
+        start_(other.start_),
+        search_position_(other.search_position_),
+        handler_(ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+    {
+    }
+#endif // defined(ASIO_HAS_MOVE)
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred, int start = 0)
+    {
+      const std::size_t not_found = (std::numeric_limits<std::size_t>::max)();
+      std::size_t bytes_to_read;
+      switch (start_ = start)
+      {
+      case 1:
+        for (;;)
+        {
+          {
+            // Determine the range of the data to be searched.
+            typedef typename DynamicBuffer::const_buffers_type
+              buffers_type;
+            typedef buffers_iterator<buffers_type> iterator;
+            buffers_type data_buffers = buffers_.data();
+            iterator begin = iterator::begin(data_buffers);
+            iterator start_pos = begin + search_position_;
+            iterator end = iterator::end(data_buffers);
+
+            // Look for a match.
+            iterator iter = std::find(start_pos, end, delim_);
+            if (iter != end)
+            {
+              // Found a match. We're done.
+              search_position_ = iter - begin + 1;
+              bytes_to_read = 0;
+            }
+
+            // No match yet. Check if buffer is full.
+            else if (buffers_.size() == buffers_.max_size())
+            {
+              search_position_ = not_found;
+              bytes_to_read = 0;
+            }
+
+            // Need to read some more data.
+            else
+            {
+              // Next search can start with the new data.
+              search_position_ = end - begin;
+              bytes_to_read = std::min<std::size_t>(
+                    std::max<std::size_t>(512,
+                      buffers_.capacity() - buffers_.size()),
+                    std::min<std::size_t>(65536,
+                      buffers_.max_size() - buffers_.size()));
+            }
+          }
+
+          // Check if we're done.
+          if (!start && bytes_to_read == 0)
+            break;
+
+          // Start a new asynchronous read operation to obtain more data.
+          stream_.async_read_some(buffers_.prepare(bytes_to_read),
+              ASIO_MOVE_CAST(read_until_delim_op)(*this));
+          return; default:
+          buffers_.commit(bytes_transferred);
+          if (ec || bytes_transferred == 0)
+            break;
+        }
+
+        const asio::error_code result_ec =
+          (search_position_ == not_found)
+          ? error::not_found : ec;
+
+        const std::size_t result_n =
+          (ec || search_position_ == not_found)
+          ? 0 : search_position_;
+
+        handler_(result_ec, result_n);
+      }
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    DynamicBuffer buffers_;
+    char delim_;
+    int start_;
+    std::size_t search_position_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_until_delim_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_until_delim_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline bool asio_handler_is_continuation(
+      read_until_delim_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    return this_handler->start_ == 0 ? true
+      : asio_handler_cont_helpers::is_continuation(
+          this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline void asio_handler_invoke(Function& function,
+      read_until_delim_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_until_delim_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <typename AsyncReadStream, typename DynamicBuffer,
+    typename ReadHandler, typename Allocator>
+struct associated_allocator<
+    detail::read_until_delim_op<AsyncReadStream,
+      DynamicBuffer, ReadHandler>,
+    Allocator>
+{
+  typedef typename associated_allocator<ReadHandler, Allocator>::type type;
+
+  static type get(
+      const detail::read_until_delim_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>& h,
+      const Allocator& a = Allocator()) ASIO_NOEXCEPT
+  {
+    return associated_allocator<ReadHandler, Allocator>::get(h.handler_, a);
+  }
+};
+
+template <typename AsyncReadStream, typename DynamicBuffer,
+    typename ReadHandler, typename Executor>
+struct associated_executor<
+    detail::read_until_delim_op<AsyncReadStream,
+      DynamicBuffer, ReadHandler>,
+    Executor>
+{
+  typedef typename associated_executor<ReadHandler, Executor>::type type;
+
+  static type get(
+      const detail::read_until_delim_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>& h,
+      const Executor& ex = Executor()) ASIO_NOEXCEPT
+  {
+    return associated_executor<ReadHandler, Executor>::get(h.handler_, ex);
+  }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+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)
+{
+  // If you get an error on the following line it means that your handler does
+  // not meet the documented type requirements for a ReadHandler.
+  ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+  async_completion<ReadHandler,
+    void (asio::error_code, std::size_t)> init(handler);
+
+  detail::read_until_delim_op<AsyncReadStream,
+    typename decay<DynamicBuffer>::type,
+      ASIO_HANDLER_TYPE(ReadHandler,
+        void (asio::error_code, std::size_t))>(
+          s, ASIO_MOVE_CAST(DynamicBuffer)(buffers),
+            delim, init.completion_handler)(asio::error_code(), 0, 1);
+
+  return init.result.get();
+}
+
+namespace detail
+{
+  template <typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  class read_until_delim_string_op
+  {
+  public:
+    template <typename BufferSequence>
+    read_until_delim_string_op(AsyncReadStream& stream,
+        ASIO_MOVE_ARG(BufferSequence) buffers,
+        const std::string& delim, ReadHandler& handler)
+      : stream_(stream),
+        buffers_(ASIO_MOVE_CAST(BufferSequence)(buffers)),
+        delim_(delim),
+        start_(0),
+        search_position_(0),
+        handler_(ASIO_MOVE_CAST(ReadHandler)(handler))
+    {
+    }
+
+#if defined(ASIO_HAS_MOVE)
+    read_until_delim_string_op(const read_until_delim_string_op& other)
+      : stream_(other.stream_),
+        buffers_(other.buffers_),
+        delim_(other.delim_),
+        start_(other.start_),
+        search_position_(other.search_position_),
+        handler_(other.handler_)
+    {
+    }
+
+    read_until_delim_string_op(read_until_delim_string_op&& other)
+      : stream_(other.stream_),
+        buffers_(ASIO_MOVE_CAST(DynamicBuffer)(other.buffers_)),
+        delim_(ASIO_MOVE_CAST(std::string)(other.delim_)),
+        start_(other.start_),
+        search_position_(other.search_position_),
+        handler_(ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+    {
+    }
+#endif // defined(ASIO_HAS_MOVE)
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred, int start = 0)
+    {
+      const std::size_t not_found = (std::numeric_limits<std::size_t>::max)();
+      std::size_t bytes_to_read;
+      switch (start_ = start)
+      {
+      case 1:
+        for (;;)
+        {
+          {
+            // Determine the range of the data to be searched.
+            typedef typename DynamicBuffer::const_buffers_type
+              buffers_type;
+            typedef buffers_iterator<buffers_type> iterator;
+            buffers_type data_buffers = buffers_.data();
+            iterator begin = iterator::begin(data_buffers);
+            iterator start_pos = begin + search_position_;
+            iterator end = iterator::end(data_buffers);
+
+            // Look for a match.
+            std::pair<iterator, bool> result = detail::partial_search(
+                start_pos, end, delim_.begin(), delim_.end());
+            if (result.first != end && result.second)
+            {
+              // Full match. We're done.
+              search_position_ = result.first - begin + delim_.length();
+              bytes_to_read = 0;
+            }
+
+            // No match yet. Check if buffer is full.
+            else if (buffers_.size() == buffers_.max_size())
+            {
+              search_position_ = not_found;
+              bytes_to_read = 0;
+            }
+
+            // Need to read some more data.
+            else
+            {
+              if (result.first != end)
+              {
+                // Partial match. Next search needs to start from beginning of
+                // match.
+                search_position_ = result.first - begin;
+              }
+              else
+              {
+                // Next search can start with the new data.
+                search_position_ = end - begin;
+              }
+
+              bytes_to_read = std::min<std::size_t>(
+                    std::max<std::size_t>(512,
+                      buffers_.capacity() - buffers_.size()),
+                    std::min<std::size_t>(65536,
+                      buffers_.max_size() - buffers_.size()));
+            }
+          }
+
+          // Check if we're done.
+          if (!start && bytes_to_read == 0)
+            break;
+
+          // Start a new asynchronous read operation to obtain more data.
+          stream_.async_read_some(buffers_.prepare(bytes_to_read),
+              ASIO_MOVE_CAST(read_until_delim_string_op)(*this));
+          return; default:
+          buffers_.commit(bytes_transferred);
+          if (ec || bytes_transferred == 0)
+            break;
+        }
+
+        const asio::error_code result_ec =
+          (search_position_ == not_found)
+          ? error::not_found : ec;
+
+        const std::size_t result_n =
+          (ec || search_position_ == not_found)
+          ? 0 : search_position_;
+
+        handler_(result_ec, result_n);
+      }
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    DynamicBuffer buffers_;
+    std::string delim_;
+    int start_;
+    std::size_t search_position_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_until_delim_string_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_until_delim_string_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline bool asio_handler_is_continuation(
+      read_until_delim_string_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    return this_handler->start_ == 0 ? true
+      : asio_handler_cont_helpers::is_continuation(
+          this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline void asio_handler_invoke(Function& function,
+      read_until_delim_string_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename DynamicBuffer, typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_until_delim_string_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <typename AsyncReadStream, typename DynamicBuffer,
+    typename ReadHandler, typename Allocator>
+struct associated_allocator<
+    detail::read_until_delim_string_op<AsyncReadStream,
+      DynamicBuffer, ReadHandler>,
+    Allocator>
+{
+  typedef typename associated_allocator<ReadHandler, Allocator>::type type;
+
+  static type get(
+      const detail::read_until_delim_string_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>& h,
+      const Allocator& a = Allocator()) ASIO_NOEXCEPT
+  {
+    return associated_allocator<ReadHandler, Allocator>::get(h.handler_, a);
+  }
+};
+
+template <typename AsyncReadStream, typename DynamicBuffer,
+    typename ReadHandler, typename Executor>
+struct associated_executor<
+    detail::read_until_delim_string_op<AsyncReadStream,
+      DynamicBuffer, ReadHandler>,
+    Executor>
+{
+  typedef typename associated_executor<ReadHandler, Executor>::type type;
+
+  static type get(
+      const detail::read_until_delim_string_op<AsyncReadStream,
+        DynamicBuffer, ReadHandler>& h,
+      const Executor& ex = Executor()) ASIO_NOEXCEPT
+  {
+    return associated_executor<ReadHandler, Executor>::get(h.handler_, ex);
+  }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+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 you get an error on the following line it means that your handler does
+  // not meet the documented type requirements for a ReadHandler.
+  ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+  async_completion<ReadHandler,
+    void (asio::error_code, std::size_t)> init(handler);
+
+  detail::read_until_delim_string_op<AsyncReadStream,
+    typename decay<DynamicBuffer>::type,
+      ASIO_HANDLER_TYPE(ReadHandler,
+        void (asio::error_code, std::size_t))>(
+          s, ASIO_MOVE_CAST(DynamicBuffer)(buffers),
+            static_cast<std::string>(delim),
+              init.completion_handler)(asio::error_code(), 0, 1);
+
+  return init.result.get();
+}
+
+#if !defined(ASIO_NO_EXTENSIONS)
+#if defined(ASIO_HAS_BOOST_REGEX)
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename DynamicBuffer,
+      typename RegEx, typename ReadHandler>
+  class read_until_expr_op
+  {
+  public:
+    template <typename BufferSequence>
+    read_until_expr_op(AsyncReadStream& stream,
+        ASIO_MOVE_ARG(BufferSequence) buffers,
+        const boost::regex& expr, ReadHandler& handler)
+      : stream_(stream),
+        buffers_(ASIO_MOVE_CAST(BufferSequence)(buffers)),
+        expr_(expr),
+        start_(0),
+        search_position_(0),
+        handler_(ASIO_MOVE_CAST(ReadHandler)(handler))
+    {
+    }
+
+#if defined(ASIO_HAS_MOVE)
+    read_until_expr_op(const read_until_expr_op& other)
+      : stream_(other.stream_),
+        buffers_(other.buffers_),
+        expr_(other.expr_),
+        start_(other.start_),
+        search_position_(other.search_position_),
+        handler_(other.handler_)
+    {
+    }
+
+    read_until_expr_op(read_until_expr_op&& other)
+      : stream_(other.stream_),
+        buffers_(ASIO_MOVE_CAST(DynamicBuffer)(other.buffers_)),
+        expr_(other.expr_),
+        start_(other.start_),
+        search_position_(other.search_position_),
+        handler_(ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+    {
+    }
+#endif // defined(ASIO_HAS_MOVE)
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred, int start = 0)
+    {
+      const std::size_t not_found = (std::numeric_limits<std::size_t>::max)();
+      std::size_t bytes_to_read;
+      switch (start_ = start)
+      {
+      case 1:
+        for (;;)
+        {
+          {
+            // Determine the range of the data to be searched.
+            typedef typename DynamicBuffer::const_buffers_type
+              buffers_type;
+            typedef buffers_iterator<buffers_type> iterator;
+            buffers_type data_buffers = buffers_.data();
+            iterator begin = iterator::begin(data_buffers);
+            iterator start_pos = begin + search_position_;
+            iterator end = iterator::end(data_buffers);
+
+            // Look for a match.
+            boost::match_results<iterator,
+              typename std::vector<boost::sub_match<iterator> >::allocator_type>
+                match_results;
+            bool match = regex_search(start_pos, end, match_results, expr_,
+                boost::match_default | boost::match_partial);
+            if (match && match_results[0].matched)
+            {
+              // Full match. We're done.
+              search_position_ = match_results[0].second - begin;
+              bytes_to_read = 0;
+            }
+
+            // No match yet. Check if buffer is full.
+            else if (buffers_.size() == buffers_.max_size())
+            {
+              search_position_ = not_found;
+              bytes_to_read = 0;
+            }
+
+            // Need to read some more data.
+            else
+            {
+              if (match)
+              {
+                // Partial match. Next search needs to start from beginning of
+                // match.
+                search_position_ = match_results[0].first - begin;
+              }
+              else
+              {
+                // Next search can start with the new data.
+                search_position_ = end - begin;
+              }
+
+              bytes_to_read = std::min<std::size_t>(
+                    std::max<std::size_t>(512,
+                      buffers_.capacity() - buffers_.size()),
+                    std::min<std::size_t>(65536,
+                      buffers_.max_size() - buffers_.size()));
+            }
+          }
+
+          // Check if we're done.
+          if (!start && bytes_to_read == 0)
+            break;
+
+          // Start a new asynchronous read operation to obtain more data.
+          stream_.async_read_some(buffers_.prepare(bytes_to_read),
+              ASIO_MOVE_CAST(read_until_expr_op)(*this));
+          return; default:
+          buffers_.commit(bytes_transferred);
+          if (ec || bytes_transferred == 0)
+            break;
+        }
+
+        const asio::error_code result_ec =
+          (search_position_ == not_found)
+          ? error::not_found : ec;
+
+        const std::size_t result_n =
+          (ec || search_position_ == not_found)
+          ? 0 : search_position_;
+
+        handler_(result_ec, result_n);
+      }
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    DynamicBuffer buffers_;
+    RegEx expr_;
+    int start_;
+    std::size_t search_position_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncReadStream, typename DynamicBuffer,
+      typename RegEx, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_until_expr_op<AsyncReadStream,
+        DynamicBuffer, RegEx, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename DynamicBuffer,
+      typename RegEx, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_until_expr_op<AsyncReadStream,
+        DynamicBuffer, RegEx, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename DynamicBuffer,
+      typename RegEx, typename ReadHandler>
+  inline bool asio_handler_is_continuation(
+      read_until_expr_op<AsyncReadStream,
+        DynamicBuffer, RegEx, ReadHandler>* this_handler)
+  {
+    return this_handler->start_ == 0 ? true
+      : asio_handler_cont_helpers::is_continuation(
+          this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename DynamicBuffer, typename RegEx, typename ReadHandler>
+  inline void asio_handler_invoke(Function& function,
+      read_until_expr_op<AsyncReadStream,
+        DynamicBuffer, RegEx, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename DynamicBuffer, typename RegEx, typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_until_expr_op<AsyncReadStream,
+        DynamicBuffer, RegEx, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <typename AsyncReadStream, typename DynamicBuffer,
+    typename RegEx, typename ReadHandler, typename Allocator>
+struct associated_allocator<
+    detail::read_until_expr_op<AsyncReadStream,
+      DynamicBuffer, RegEx, ReadHandler>,
+    Allocator>
+{
+  typedef typename associated_allocator<ReadHandler, Allocator>::type type;
+
+  static type get(
+      const detail::read_until_expr_op<AsyncReadStream,
+        DynamicBuffer, RegEx, ReadHandler>& h,
+      const Allocator& a = Allocator()) ASIO_NOEXCEPT
+  {
+    return associated_allocator<ReadHandler, Allocator>::get(h.handler_, a);
+  }
+};
+
+template <typename AsyncReadStream, typename DynamicBuffer,
+    typename RegEx, typename ReadHandler, typename Executor>
+struct associated_executor<
+    detail::read_until_expr_op<AsyncReadStream,
+      DynamicBuffer, RegEx, ReadHandler>,
+    Executor>
+{
+  typedef typename associated_executor<ReadHandler, Executor>::type type;
+
+  static type get(
+      const detail::read_until_expr_op<AsyncReadStream,
+        DynamicBuffer, RegEx, ReadHandler>& h,
+      const Executor& ex = Executor()) ASIO_NOEXCEPT
+  {
+    return associated_executor<ReadHandler, Executor>::get(h.handler_, ex);
+  }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+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)
+{
+  // If you get an error on the following line it means that your handler does
+  // not meet the documented type requirements for a ReadHandler.
+  ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+  async_completion<ReadHandler,
+    void (asio::error_code, std::size_t)> init(handler);
+
+  detail::read_until_expr_op<AsyncReadStream,
+    typename decay<DynamicBuffer>::type,
+      boost::regex, ASIO_HANDLER_TYPE(ReadHandler,
+        void (asio::error_code, std::size_t))>(
+          s, ASIO_MOVE_CAST(DynamicBuffer)(buffers),
+            expr, init.completion_handler)(asio::error_code(), 0, 1);
+
+  return init.result.get();
+}
+
+#endif // defined(ASIO_HAS_BOOST_REGEX)
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename DynamicBuffer,
+      typename MatchCondition, typename ReadHandler>
+  class read_until_match_op
+  {
+  public:
+    template <typename BufferSequence>
+    read_until_match_op(AsyncReadStream& stream,
+        ASIO_MOVE_ARG(BufferSequence) buffers,
+        MatchCondition match_condition, ReadHandler& handler)
+      : stream_(stream),
+        buffers_(ASIO_MOVE_CAST(BufferSequence)(buffers)),
+        match_condition_(match_condition),
+        start_(0),
+        search_position_(0),
+        handler_(ASIO_MOVE_CAST(ReadHandler)(handler))
+    {
+    }
+
+#if defined(ASIO_HAS_MOVE)
+    read_until_match_op(const read_until_match_op& other)
+      : stream_(other.stream_),
+        buffers_(other.buffers_),
+        match_condition_(other.match_condition_),
+        start_(other.start_),
+        search_position_(other.search_position_),
+        handler_(other.handler_)
+    {
+    }
+
+    read_until_match_op(read_until_match_op&& other)
+      : stream_(other.stream_),
+        buffers_(ASIO_MOVE_CAST(DynamicBuffer)(other.buffers_)),
+        match_condition_(other.match_condition_),
+        start_(other.start_),
+        search_position_(other.search_position_),
+        handler_(ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+    {
+    }
+#endif // defined(ASIO_HAS_MOVE)
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred, int start = 0)
+    {
+      const std::size_t not_found = (std::numeric_limits<std::size_t>::max)();
+      std::size_t bytes_to_read;
+      switch (start_ = start)
+      {
+      case 1:
+        for (;;)
+        {
+          {
+            // Determine the range of the data to be searched.
+            typedef typename DynamicBuffer::const_buffers_type
+              buffers_type;
+            typedef buffers_iterator<buffers_type> iterator;
+            buffers_type data_buffers = buffers_.data();
+            iterator begin = iterator::begin(data_buffers);
+            iterator start_pos = begin + search_position_;
+            iterator end = iterator::end(data_buffers);
+
+            // Look for a match.
+            std::pair<iterator, bool> result = match_condition_(start_pos, end);
+            if (result.second)
+            {
+              // Full match. We're done.
+              search_position_ = result.first - begin;
+              bytes_to_read = 0;
+            }
+
+            // No match yet. Check if buffer is full.
+            else if (buffers_.size() == buffers_.max_size())
+            {
+              search_position_ = not_found;
+              bytes_to_read = 0;
+            }
+
+            // Need to read some more data.
+            else
+            {
+              if (result.first != end)
+              {
+                // Partial match. Next search needs to start from beginning of
+                // match.
+                search_position_ = result.first - begin;
+              }
+              else
+              {
+                // Next search can start with the new data.
+                search_position_ = end - begin;
+              }
+
+              bytes_to_read = std::min<std::size_t>(
+                    std::max<std::size_t>(512,
+                      buffers_.capacity() - buffers_.size()),
+                    std::min<std::size_t>(65536,
+                      buffers_.max_size() - buffers_.size()));
+            }
+          }
+
+          // Check if we're done.
+          if (!start && bytes_to_read == 0)
+            break;
+
+          // Start a new asynchronous read operation to obtain more data.
+          stream_.async_read_some(buffers_.prepare(bytes_to_read),
+              ASIO_MOVE_CAST(read_until_match_op)(*this));
+          return; default:
+          buffers_.commit(bytes_transferred);
+          if (ec || bytes_transferred == 0)
+            break;
+        }
+
+        const asio::error_code result_ec =
+          (search_position_ == not_found)
+          ? error::not_found : ec;
+
+        const std::size_t result_n =
+          (ec || search_position_ == not_found)
+          ? 0 : search_position_;
+
+        handler_(result_ec, result_n);
+      }
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    DynamicBuffer buffers_;
+    MatchCondition match_condition_;
+    int start_;
+    std::size_t search_position_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncReadStream, typename DynamicBuffer,
+      typename MatchCondition, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_until_match_op<AsyncReadStream, DynamicBuffer,
+        MatchCondition, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename DynamicBuffer,
+      typename MatchCondition, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_until_match_op<AsyncReadStream, DynamicBuffer,
+        MatchCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename DynamicBuffer,
+      typename MatchCondition, typename ReadHandler>
+  inline bool asio_handler_is_continuation(
+      read_until_match_op<AsyncReadStream, DynamicBuffer,
+        MatchCondition, ReadHandler>* this_handler)
+  {
+    return this_handler->start_ == 0 ? true
+      : asio_handler_cont_helpers::is_continuation(
+          this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename DynamicBuffer, typename MatchCondition,
+      typename ReadHandler>
+  inline void asio_handler_invoke(Function& function,
+      read_until_match_op<AsyncReadStream, DynamicBuffer,
+        MatchCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename DynamicBuffer, typename MatchCondition,
+      typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_until_match_op<AsyncReadStream, DynamicBuffer,
+      MatchCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <typename AsyncReadStream, typename DynamicBuffer,
+    typename MatchCondition, typename ReadHandler, typename Allocator>
+struct associated_allocator<
+    detail::read_until_match_op<AsyncReadStream,
+      DynamicBuffer, MatchCondition, ReadHandler>,
+    Allocator>
+{
+  typedef typename associated_allocator<ReadHandler, Allocator>::type type;
+
+  static type get(
+      const detail::read_until_match_op<AsyncReadStream,
+        DynamicBuffer, MatchCondition, ReadHandler>& h,
+      const Allocator& a = Allocator()) ASIO_NOEXCEPT
+  {
+    return associated_allocator<ReadHandler, Allocator>::get(h.handler_, a);
+  }
+};
+
+template <typename AsyncReadStream, typename DynamicBuffer,
+    typename MatchCondition, typename ReadHandler, typename Executor>
+struct associated_executor<
+    detail::read_until_match_op<AsyncReadStream,
+      DynamicBuffer, MatchCondition, ReadHandler>,
+    Executor>
+{
+  typedef typename associated_executor<ReadHandler, Executor>::type type;
+
+  static type get(
+      const detail::read_until_match_op<AsyncReadStream,
+        DynamicBuffer, MatchCondition, ReadHandler>& h,
+      const Executor& ex = Executor()) ASIO_NOEXCEPT
+  {
+    return associated_executor<ReadHandler, Executor>::get(h.handler_, ex);
+  }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+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*)
+{
+  // If you get an error on the following line it means that your handler does
+  // not meet the documented type requirements for a ReadHandler.
+  ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+  async_completion<ReadHandler,
+    void (asio::error_code, std::size_t)> init(handler);
+
+  detail::read_until_match_op<AsyncReadStream,
+    typename decay<DynamicBuffer>::type,
+      MatchCondition, ASIO_HANDLER_TYPE(ReadHandler,
+        void (asio::error_code, std::size_t))>(
+          s, ASIO_MOVE_CAST(DynamicBuffer)(buffers),
+            match_condition, init.completion_handler)(
+              asio::error_code(), 0, 1);
+
+  return init.result.get();
+}
+
+#if !defined(ASIO_NO_IOSTREAM)
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+inline 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)
+{
+  return async_read_until(s, basic_streambuf_ref<Allocator>(b),
+      delim, ASIO_MOVE_CAST(ReadHandler)(handler));
+}
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+inline 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)
+{
+  return async_read_until(s, basic_streambuf_ref<Allocator>(b),
+      delim, ASIO_MOVE_CAST(ReadHandler)(handler));
+}
+
+#if defined(ASIO_HAS_BOOST_REGEX)
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+inline 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)
+{
+  return async_read_until(s, basic_streambuf_ref<Allocator>(b),
+      expr, ASIO_MOVE_CAST(ReadHandler)(handler));
+}
+
+#endif // defined(ASIO_HAS_BOOST_REGEX)
+
+template <typename AsyncReadStream, typename Allocator,
+    typename MatchCondition, typename ReadHandler>
+inline 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*)
+{
+  return async_read_until(s, basic_streambuf_ref<Allocator>(b),
+      match_condition, ASIO_MOVE_CAST(ReadHandler)(handler));
+}
+
+#endif // !defined(ASIO_NO_IOSTREAM)
+#endif // !defined(ASIO_NO_EXTENSIONS)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IMPL_READ_UNTIL_HPP