mirror of https://github.com/ArduPilot/ardupilot
88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
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/*
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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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// 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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