boost/core/functor.hpp

0001 /*
0002  *             Copyright Andrey Semashev 2024.
0003  * Distributed under the Boost Software License, Version 1.0.
0004  *    (See accompanying file LICENSE_1_0.txt or copy at
0005  *          http://www.boost.org/LICENSE_1_0.txt)
0006  */
0007 /*!
0008  * \file   functor.hpp
0009  * \author Andrey Semashev
0010  * \date   2024-01-23
0011  *
0012  * This header contains a \c functor implementation. This is a function object
0013  * that invokes a function that is specified as its template parameter.
0014  */
0015
0016 #ifndef BOOST_CORE_FUNCTOR_HPP
0017 #define BOOST_CORE_FUNCTOR_HPP
0018
0019 namespace boost::core {
0020
0021 // Block unintended ADL
0022 namespace functor_ns {
0023
0024 //! A function object that invokes a function specified as its template parameter
0025 template< auto Function >
0026 struct functor
0027 {
0028     template< typename... Args >
0029     auto operator() (Args&&... args) const noexcept(noexcept(Function(static_cast< Args&& >(args)...))) -> decltype(Function(static_cast< Args&& >(args)...))
0030     {
0031         return Function(static_cast< Args&& >(args)...);
0032     }
0033 };
0034
0035 } // namespace functor_ns
0036
0037 using functor_ns::functor;
0038
0039 } // namespace boost::core
0040
0041 #endif // BOOST_CORE_FUNCTOR_HPP