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90 lines
2.6 KiB
90 lines
2.6 KiB
/* |
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* Copyright (C) 2015 Intel Corporation. All rights reserved. |
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* |
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* This file is free software: you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This file is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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* See the GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include <type_traits> |
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#define FUNCTOR_TYPEDEF(name, rettype, ...) \ |
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typedef Functor<rettype, ## __VA_ARGS__> name |
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#define FUNCTOR_DECLARE(name, rettype, ...) \ |
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Functor<rettype, ## __VA_ARGS__> name |
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#define FUNCTOR_BIND(obj, func, rettype, ...) \ |
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Functor<rettype, ## __VA_ARGS__>::bind<std::remove_reference<decltype(*obj)>::type, func>(obj) |
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#define FUNCTOR_BIND_MEMBER(func, rettype, ...) \ |
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Functor<rettype, ## __VA_ARGS__>::bind<std::remove_reference<decltype(*this)>::type, func>(this) |
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template <class RetType, class... Args> |
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class Functor |
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{ |
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public: |
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constexpr Functor(void *obj, RetType (*method)(void *obj, Args...)) |
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: _obj(obj) |
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, _method(method) |
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{ |
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} |
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// Allow to construct an empty Functor |
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constexpr Functor(decltype(nullptr)) |
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: Functor(nullptr, nullptr) { } |
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constexpr Functor() |
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: Functor(nullptr, nullptr) { } |
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// Call the method on the obj this Functor is bound to |
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RetType operator()(Args... args) const |
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{ |
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return _method(_obj, args...); |
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} |
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// Compare if the two Functors are calling the same method in the same |
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// object |
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inline bool operator==(const Functor<RetType, Args...>& rhs) |
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{ |
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return _obj == rhs._obj && _method == rhs._method; |
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} |
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inline bool operator!=(const Functor<RetType, Args...>& rhs) |
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{ |
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return _obj != rhs._obj || _method != rhs._method; |
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} |
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// Allow to check if there's a method set in the Functor |
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explicit operator bool() const |
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{ |
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return _method != nullptr; |
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} |
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template<class T, RetType (T::*method)(Args...)> |
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static constexpr Functor bind(T *obj) |
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{ |
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return { obj, method_wrapper<T, method> }; |
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} |
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private: |
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void *_obj; |
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RetType (*_method)(void *obj, Args...); |
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template<class T, RetType (T::*method)(Args...)> |
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static RetType method_wrapper(void *obj, Args... args) |
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{ |
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T *t = static_cast<T*>(obj); |
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return (t->*method)(args...); |
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} |
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};
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