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6d8c73cc52
* Concepts split up into individual files * Function definitions moved to .ipp files * Add more tests to fill gaps in coverage * Fix documentation Xsl
141 lines
4.0 KiB
C++
141 lines
4.0 KiB
C++
//
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// Copyright (c) 2013-2016 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BEAST_DETAIL_WRITE_STREAMBUF_HPP
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#define BEAST_DETAIL_WRITE_STREAMBUF_HPP
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#include <beast/buffer_concepts.hpp>
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#include <boost/asio/buffer.hpp>
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#include <boost/lexical_cast.hpp>
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#include <utility>
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namespace beast {
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namespace detail {
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// detects string literals.
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template<class T>
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struct is_string_literal : std::integral_constant<bool,
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! std::is_same<T, typename std::remove_extent<T>::type>::value &&
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std::is_same<char, typename std::remove_extent<T>::type>::value>
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{
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};
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// `true` if a call to boost::asio::buffer(T const&) is possible
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// note: we exclude string literals because boost::asio::buffer()
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// will include the null terminator, which we don't want.
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template<class T>
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class is_BufferConvertible
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{
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template<class U, class R = decltype(
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boost::asio::buffer(std::declval<U const&>()),
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std::true_type{})>
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static R check(int);
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template<class>
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static std::false_type check(...);
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using type = decltype(check<T>(0));
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public:
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static bool const value = type::value &&
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! is_string_literal<T>::value;
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};
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template<class Streambuf>
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void
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write_streambuf(Streambuf& streambuf,
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boost::asio::const_buffer const& buffer)
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{
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using boost::asio::buffer_copy;
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using boost::asio::buffer_size;
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streambuf.commit(buffer_copy(
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streambuf.prepare(buffer_size(buffer)),
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buffer));
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}
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template<class Streambuf>
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void
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write_streambuf(Streambuf& streambuf,
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boost::asio::mutable_buffer const& buffer)
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{
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using boost::asio::buffer_copy;
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using boost::asio::buffer_size;
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streambuf.commit(buffer_copy(
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streambuf.prepare(buffer_size(buffer)),
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buffer));
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}
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template<class Streambuf, class T>
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typename std::enable_if<
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is_BufferConvertible<T>::value &&
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! std::is_convertible<T, boost::asio::const_buffer>::value &&
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! std::is_convertible<T, boost::asio::mutable_buffer>::value
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>::type
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write_streambuf(Streambuf& streambuf, T const& t)
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{
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using boost::asio::buffer_copy;
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using boost::asio::buffer_size;
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auto const buffers = boost::asio::buffer(t);
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streambuf.commit(buffer_copy(
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streambuf.prepare(buffer_size(buffers)),
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buffers));
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}
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template<class Streambuf, class Buffers>
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typename std::enable_if<
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is_ConstBufferSequence<Buffers>::value &&
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! is_BufferConvertible<Buffers>::value &&
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! std::is_convertible<Buffers, boost::asio::const_buffer>::value &&
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! std::is_convertible<Buffers, boost::asio::mutable_buffer>::value
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>::type
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write_streambuf(Streambuf& streambuf, Buffers const& buffers)
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{
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using boost::asio::buffer_copy;
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using boost::asio::buffer_size;
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streambuf.commit(buffer_copy(
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streambuf.prepare(buffer_size(buffers)),
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buffers));
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}
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template<class Streambuf, std::size_t N>
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void
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write_streambuf(Streambuf& streambuf, const char (&s)[N])
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{
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using boost::asio::buffer_copy;
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streambuf.commit(buffer_copy(
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streambuf.prepare(N - 1),
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boost::asio::buffer(s, N - 1)));
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}
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template<class Streambuf, class T>
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typename std::enable_if<
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! is_string_literal<T>::value &&
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! is_ConstBufferSequence<T>::value &&
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! is_BufferConvertible<T>::value &&
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! std::is_convertible<T, boost::asio::const_buffer>::value &&
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! std::is_convertible<T, boost::asio::mutable_buffer>::value
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>::type
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write_streambuf(Streambuf& streambuf, T const& t)
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{
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using boost::asio::buffer;
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using boost::asio::buffer_copy;
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auto const s = boost::lexical_cast<std::string>(t);
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streambuf.commit(buffer_copy(
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streambuf.prepare(s.size()), buffer(s)));
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}
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template<class Streambuf, class T0, class T1, class... TN>
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void
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write_streambuf(Streambuf& streambuf,
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T0 const& t0, T1 const& t1, TN const&... tn)
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{
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write_streambuf(streambuf, t0);
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write_streambuf(streambuf, t1, tn...);
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}
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} // detail
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} // beast
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#endif
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