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9e5e16c18d
The version field is moved into message_v1, all public interfaces are reworked to identify HTTP/1 wire format operations (suffix "_v1") versus general HTTP.
44 lines
1.1 KiB
C++
44 lines
1.1 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_HTTP_DETAIL_HAS_CONTENT_LENGTH_HPP
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#define BEAST_HTTP_DETAIL_HAS_CONTENT_LENGTH_HPP
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#include <cstdint>
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#include <type_traits>
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namespace beast {
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namespace http {
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namespace detail {
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template<class T>
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class has_content_length_value
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{
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template<class U, class R = typename std::is_convertible<
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decltype(std::declval<U>().content_length()),
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std::uint64_t>>
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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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// `true` if `T` meets the requirements.
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static bool const value = type::value;
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};
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// Determines if the writer can provide the content length
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template<class T>
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using has_content_length =
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std::integral_constant<bool,
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has_content_length_value<T>::value>;
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} // detail
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} // http
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} // beast
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#endif
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