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//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail 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)
//
// Official repository: https://github.com/boostorg/beast
//
#ifndef BOOST_BEAST_TYPE_TRAITS_HPP
#define BOOST_BEAST_TYPE_TRAITS_HPP
#ifndef BOOST_BEAST_DOXYGEN
#include <boost/beast/core/detail/config.hpp>
#include <boost/beast/core/detail/is_invocable.hpp>
#include <boost/config/pragma_message.hpp>
#include <type_traits.hpp>
BOOST_PRAGMA_MESSAGE("<boost/beast/core/type_traits.hpp> is DEPRECATED and will be removed in a future release.")
namespace boost {
namespace beast {
/** Determine if `T` meets the requirements of <em>CompletionHandler</em>.
This trait checks whether a type meets the requirements for a completion
handler, and is also callable with the specified signature.
Metafunctions are used to perform compile time checking of template
types. This type will be `std::true_type` if `T` meets the requirements,
else the type will be `std::false_type`.
@par Example
Use with `static_assert`:
@code
struct handler
{
void operator()(error_code&);
};
static_assert(is_completion_handler<handler, void(error_code&)>::value,
"Not a completion handler");
@endcode
*/
template<class T, class Signature>
#if BOOST_BEAST_DOXYGEN
using is_completion_handler = __see_below__
#else
using is_completion_handler = std::integral_constant<bool,
std::is_move_constructible<typename std::decay<T>::type>::value &&
detail::is_invocable<T, Signature>::value>;
#endif
} // beast
} // boost
#endif
#endif
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