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//
// detail/is_buffer_sequence.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_DETAIL_IS_BUFFER_SEQUENCE_HPP
#define ASIO_DETAIL_IS_BUFFER_SEQUENCE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/type_traits.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
class mutable_buffer;
class const_buffer;
namespace detail {
struct buffer_sequence_memfns_base
{
void begin();
void end();
void size();
void max_size();
void capacity();
void data();
void prepare();
void commit();
void consume();
};
template <typename T>
struct buffer_sequence_memfns_derived
: T, buffer_sequence_memfns_base
{
};
template <typename T, T>
struct buffer_sequence_memfns_check
{
};
template <typename>
char (&begin_memfn_helper(...))[2];
template <typename T>
char begin_memfn_helper(
buffer_sequence_memfns_check<
void (buffer_sequence_memfns_base::*)(),
&buffer_sequence_memfns_derived<T>::begin>*);
template <typename>
char (&end_memfn_helper(...))[2];
template <typename T>
char end_memfn_helper(
buffer_sequence_memfns_check<
void (buffer_sequence_memfns_base::*)(),
&buffer_sequence_memfns_derived<T>::end>*);
template <typename>
char (&size_memfn_helper(...))[2];
template <typename T>
char size_memfn_helper(
buffer_sequence_memfns_check<
void (buffer_sequence_memfns_base::*)(),
&buffer_sequence_memfns_derived<T>::size>*);
template <typename>
char (&max_size_memfn_helper(...))[2];
template <typename T>
char max_size_memfn_helper(
buffer_sequence_memfns_check<
void (buffer_sequence_memfns_base::*)(),
&buffer_sequence_memfns_derived<T>::max_size>*);
template <typename>
char (&capacity_memfn_helper(...))[2];
template <typename T>
char capacity_memfn_helper(
buffer_sequence_memfns_check<
void (buffer_sequence_memfns_base::*)(),
&buffer_sequence_memfns_derived<T>::capacity>*);
template <typename>
char (&data_memfn_helper(...))[2];
template <typename T>
char data_memfn_helper(
buffer_sequence_memfns_check<
void (buffer_sequence_memfns_base::*)(),
&buffer_sequence_memfns_derived<T>::data>*);
template <typename>
char (&prepare_memfn_helper(...))[2];
template <typename T>
char prepare_memfn_helper(
buffer_sequence_memfns_check<
void (buffer_sequence_memfns_base::*)(),
&buffer_sequence_memfns_derived<T>::prepare>*);
template <typename>
char (&commit_memfn_helper(...))[2];
template <typename T>
char commit_memfn_helper(
buffer_sequence_memfns_check<
void (buffer_sequence_memfns_base::*)(),
&buffer_sequence_memfns_derived<T>::commit>*);
template <typename>
char (&consume_memfn_helper(...))[2];
template <typename T>
char consume_memfn_helper(
buffer_sequence_memfns_check<
void (buffer_sequence_memfns_base::*)(),
&buffer_sequence_memfns_derived<T>::consume>*);
template <typename, typename>
char (&buffer_element_type_helper(...))[2];
#if defined(ASIO_HAS_DECL_TYPE)
template <typename T, typename Buffer>
char buffer_element_type_helper(T* t,
typename enable_if<is_convertible<
decltype(*buffer_sequence_begin(*t)),
Buffer>::value>::type*);
#else // defined(ASIO_HAS_DECL_TYPE)
template <typename T, typename Buffer>
char buffer_element_type_helper(
typename T::const_iterator*,
typename enable_if<is_convertible<
typename T::value_type, Buffer>::value>::type*);
#endif // defined(ASIO_HAS_DECL_TYPE)
template <typename>
char (&const_buffers_type_typedef_helper(...))[2];
template <typename T>
char const_buffers_type_typedef_helper(
typename T::const_buffers_type*);
template <typename>
char (&mutable_buffers_type_typedef_helper(...))[2];
template <typename T>
char mutable_buffers_type_typedef_helper(
typename T::mutable_buffers_type*);
template <typename T, typename Buffer>
struct is_buffer_sequence_class
: integral_constant<bool,
sizeof(begin_memfn_helper<T>(0)) != 1 &&
sizeof(end_memfn_helper<T>(0)) != 1 &&
sizeof(buffer_element_type_helper<T, Buffer>(0, 0)) == 1>
{
};
template <typename T, typename Buffer>
struct is_buffer_sequence
: conditional<is_class<T>::value,
is_buffer_sequence_class<T, Buffer>,
false_type>::type
{
};
template <>
struct is_buffer_sequence<mutable_buffer, mutable_buffer>
: true_type
{
};
template <>
struct is_buffer_sequence<mutable_buffer, const_buffer>
: true_type
{
};
template <>
struct is_buffer_sequence<const_buffer, const_buffer>
: true_type
{
};
template <>
struct is_buffer_sequence<const_buffer, mutable_buffer>
: false_type
{
};
template <typename T>
struct is_dynamic_buffer_class
: integral_constant<bool,
sizeof(size_memfn_helper<T>(0)) != 1 &&
sizeof(max_size_memfn_helper<T>(0)) != 1 &&
sizeof(capacity_memfn_helper<T>(0)) != 1 &&
sizeof(data_memfn_helper<T>(0)) != 1 &&
sizeof(consume_memfn_helper<T>(0)) != 1 &&
sizeof(prepare_memfn_helper<T>(0)) != 1 &&
sizeof(commit_memfn_helper<T>(0)) != 1 &&
sizeof(const_buffers_type_typedef_helper<T>(0)) == 1 &&
sizeof(mutable_buffers_type_typedef_helper<T>(0)) == 1>
{
};
template <typename T>
struct is_dynamic_buffer
: conditional<is_class<T>::value,
is_dynamic_buffer_class<T>,
false_type>::type
{
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_IS_BUFFER_SEQUENCE_HPP
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