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78 lines
2.7 KiB
78 lines
2.7 KiB
/*
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* Copyright (c) 2010-2017 OTClient <https://github.com/edubart/otclient>
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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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*/
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#ifndef STDEXT_ANY_H
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#define STDEXT_ANY_H
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#include <algorithm>
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#include <cassert>
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#include <typeinfo>
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namespace stdext {
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class any {
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public:
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struct placeholder {
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virtual ~placeholder() { }
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virtual const std::type_info& type() const = 0;
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virtual placeholder* clone() const = 0;
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};
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template<typename T>
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struct holder : public placeholder {
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holder(const T& value) : held(value) { }
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const std::type_info& type() const { return typeid(T); }
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placeholder* clone() const { return new holder(held); }
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T held;
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private:
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holder& operator=(const holder &);
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};
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placeholder* content;
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any() : content(nullptr) { }
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any(const any& other) : content(other.content ? other.content->clone() : nullptr) { }
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template<typename T> any(const T& value) : content(new holder<T>(value)) { }
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~any() { if(content) delete content; }
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any& swap(any& rhs) { std::swap(content, rhs.content); return *this; }
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template<typename T> any& operator=(const T& rhs) { any(rhs).swap(*this); return *this; }
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any& operator=(any rhs) { rhs.swap(*this); return *this; }
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bool empty() const { return !content; }
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template<typename T> const T& cast() const;
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const std::type_info & type() const { return content ? content->type() : typeid(void); }
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};
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template<typename T>
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const T& any_cast(const any& operand) {
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assert(operand.type() == typeid(T));
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return static_cast<any::holder<T>*>(operand.content)->held;
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}
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template<typename T> const T& any::cast() const { return any_cast<T>(*this); }
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}
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#endif
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