84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
// Copyright (c) 2016-2018 Easy2D - Nomango
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#pragma once
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#include <functional>
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namespace easy2d
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{
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//
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// Closure is a simple function for binding member functions
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//
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template<typename _Ty, typename _Ret, typename... _Args>
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std::function<_Ret(_Args...)> Closure(_Ty* _Ptr, _Ret(_Ty::*_Func)(_Args...));
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//
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// Details of Closure
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//
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namespace __closure__detail
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{
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// sequence & generater
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template<int... _Num>
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struct Seq
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{
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using NextType = Seq<_Num..., sizeof...(_Num)>;
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};
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template<typename...>
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struct Gen;
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template<>
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struct Gen<>
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{
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using SeqType = Seq<>;
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};
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template<typename _Ty1, typename... _Args>
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struct Gen<_Ty1, _Args...>
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{
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using SeqType = typename Gen<_Args...>::SeqType::NextType;
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};
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// ClosureHelper
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template<typename _Ty, typename _Ret, typename... _Args>
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struct ClosureHelper
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{
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template<int... _Num>
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static inline std::function<_Ret(_Args...)> MakeFunc(_Ty* _Ptr, _Ret(_Ty::*_Func)(_Args...), Seq<_Num...>)
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{
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return std::bind(_Func, _Ptr, std::_Ph<_Num + 1>()...);
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}
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};
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}
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template<typename _Ty, typename _Ret, typename... _Args>
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inline std::function<_Ret(_Args...)> Closure(_Ty* _Ptr, _Ret(_Ty::*_Func)(_Args...))
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{
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using namespace __closure__detail;
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return ClosureHelper<_Ty, _Ret, _Args...>::
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MakeFunc(_Ptr, _Func, typename Gen<_Args...>::SeqType{});
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}
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}
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