include/function.hpp - main - Ant010ff/ffpp

include/function.hpp
71 строка2 KB
Ant010ff
Version 2.11.3.
08 авг 2026, 16:44
08 авг 2026, 16:44fd187d3
/*
This header is part of a Functional Flow Processing Primitives (FFPP) library, version 2.11.3.

Official repository: https://gitlab.com/ant010ff/ffpp

Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2021 - 2026 Anton Nasonov <ant010fff @ gmail . com>
*/

#ifndef FFPP_FUNCTION_HPP
#define FFPP_FUNCTION_HPP

namespace FFPP {

	namespace dtl {

		template<bool t_bUnique>
		struct FunctionSelector {
			template<typename TSignature>
			using Type = std::function<TSignature>;
		};

		#if FFPP_UNIQUE_FUNCTION

			template<>
			struct FunctionSelector<true> {
				template<typename TSignature>
				using Type = std::move_only_function<TSignature>;
			};

		#else

			#ifdef FU2_INCLUDED_FUNCTION2_HPP_

				#ifndef FFPP_FU2_UNIQUE_FUNCTION
					#define FFPP_FU2_UNIQUE_FUNCTION (1)
				#endif

				//Using fu2::unique_function by Denis Blank as a replacement for std::move_only_function. In case of VS2022 17.9.5 
				//(MSVC 19.39.33523) its performance appeared to be inferior to std::move_only_function according to synthetic tests.
				template<>
				struct FunctionSelector<true> {
					template<typename TSignature>
					using Type = fu2::unique_function<TSignature>;
				};

			#else

				#if FFPP_ENABLE_DEBUG
				#pragma message("FFPP warning: std::move_only_function is not available in current build. Consider including function2 (https://github.com/Naios/function2) before ffpp.hpp or upgrade your toolchain to C++ 23 compliant.")
				#endif

				template<>
				struct FunctionSelector<true> {
					template<typename TSignature>
					using Type = std::function<TSignature>;
				};

			#endif

		#endif

	}//dtl

	template<typename TSignature, bool t_bUnique = true>
	using Function = dtl::FunctionSelector<t_bUnique>::template Type<TSignature>;

}//FFPP

#endif//FFPP_FUNCTION_HPP