experimental/detail/has_signature.hpp

0001 //
0002 // experimental/detail/has_signature.hpp
0003 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0004 //
0005 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0009 //
0010
0011 #ifndef BOOST_ASIO_EXPERIMENTAL_DETAIL_HAS_SIGNATURE_HPP
0012 #define BOOST_ASIO_EXPERIMENTAL_DETAIL_HAS_SIGNATURE_HPP
0013
0014 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
0015 # pragma once
0016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
0017
0018 #include <boost/asio/detail/config.hpp>
0019 #include <boost/asio/detail/type_traits.hpp>
0020
0021 #include <boost/asio/detail/push_options.hpp>
0022
0023 namespace boost {
0024 namespace asio {
0025 namespace experimental {
0026 namespace detail {
0027
0028 template <typename S, typename... Signatures>
0029 struct has_signature;
0030
0031 template <typename S, typename... Signatures>
0032 struct has_signature;
0033
0034 template <typename S>
0035 struct has_signature<S> : false_type
0036 {
0037 };
0038
0039 template <typename S, typename... Signatures>
0040 struct has_signature<S, S, Signatures...> : true_type
0041 {
0042 };
0043
0044 template <typename S, typename Head, typename... Tail>
0045 struct has_signature<S, Head, Tail...> : has_signature<S, Tail...>
0046 {
0047 };
0048
0049 } // namespace detail
0050 } // namespace experimental
0051 } // namespace asio
0052 } // namespace boost
0053
0054 #include <boost/asio/detail/pop_options.hpp>
0055
0056 #endif // BOOST_ASIO_EXPERIMENTAL_DETAIL_HAS_SIGNATURE_HPP