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90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
//
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// Copyright (c) 2017 Mike Gresens (mike dot gresens 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_EXAMPLE_COMMON_CONST_BODY_HPP
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#define BEAST_EXAMPLE_COMMON_CONST_BODY_HPP
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#include <beast/http/message.hpp>
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#include <boost/asio/buffer.hpp>
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#include <boost/optional.hpp>
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namespace detail {
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template <typename T>
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using is_const_character = std::integral_constant<bool,
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std::is_integral<T>::value &&
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sizeof(T) == 1
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>;
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template<class T, class = void>
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struct is_const_container : std::false_type { };
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template<class T>
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struct is_const_container<T, beast::detail::void_t<
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decltype( std::declval<typename T::size_type&>() = std::declval<T&>().size() ),
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decltype( std::declval<const typename T::value_type*&>() = std::declval<T&>().data() )
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> > : std::true_type { };
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}
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/** An HTTP message body represented by a constant character container.
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Meets the requirements of @b Body.
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*/
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template <typename ConstContainer>
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struct const_body
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{
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static_assert(
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detail::is_const_character<typename ConstContainer::value_type>::value &&
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detail::is_const_container<ConstContainer>::value,
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"ConstContainer requirements not met");
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/// The type of the body member when used in a message.
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using value_type = ConstContainer;
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/// Returns the content length of the body in a message.
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static
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std::uint64_t
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size(value_type const& v)
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{
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return v.size();
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}
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#if BEAST_DOXYGEN
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/// The algorithm to obtain buffers representing the body
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using reader = implementation_defined;
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#else
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class reader
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{
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value_type const& body_;
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public:
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using const_buffers_type =
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boost::asio::const_buffers_1;
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template<bool isRequest, class Fields>
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explicit
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reader(beast::http::message<isRequest, const_body,
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Fields> const& msg, beast::error_code& ec)
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: body_(msg.body)
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{
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ec.assign(0, ec.category());
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}
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boost::optional<std::pair<const_buffers_type, bool>>
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get(beast::error_code& ec)
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{
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ec.assign(0, ec.category());
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return {{const_buffers_type{
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body_.data(), body_.size()}, false}};
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}
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};
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#endif
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};
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#endif
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