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67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
//=======================================================================
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// Copyright Baptiste Wicht 2013-2016.
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// Distributed under the terms of the MIT License.
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// (See accompanying file LICENSE or copy at
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// http://www.opensource.org/licenses/MIT)
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//=======================================================================
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#ifndef STD_FUNCTION_HPP
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#define STD_FUNCTION_HPP
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#include <algorithms.hpp>
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#include <type_traits.hpp>
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namespace std {
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template<typename>
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struct function;
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template<typename R, typename... Args>
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struct function<R(Args...)> {
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public:
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template<typename T>
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function(T&& t){
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typedef model<typename std::decay<T>::type> impl;
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static_assert(sizeof(impl) <= sizeof(storage), "Limited size in function");
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static_assert(std::is_trivially_destructible<T>::value, "Limited support of function");
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new (&storage) impl(std::forward<T>(t));
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}
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function(const function& rhs) = delete;
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function& operator=(const function& rhs) = delete;
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function(function&& rhs) = delete;
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function& operator=(function&& rhs) = delete;
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R operator()(Args... args) const {
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return (*reinterpret_cast<const concept*>(&storage))(std::forward<Args>(args)...);
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}
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private:
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size_t storage[2];
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struct concept {
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virtual R operator()(Args...) const = 0;
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};
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template<typename T>
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struct model : concept {
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template<typename U>
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model(U&& u) : t(std::forward<U>(u)){
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//Nothing to init
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}
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R operator()(Args... args) const override {
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return t(std::forward<Args>(args)...);
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}
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T t;
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};
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};
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} //end of namespace std
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#endif
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