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118 lines
4.0 KiB
118 lines
4.0 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_PACKEDANY_H
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#define STDEXT_PACKEDANY_H
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#include <algorithm>
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#include <cassert>
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#include <type_traits>
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#include <typeinfo>
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namespace stdext {
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// disable memory alignment
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#pragma pack(push,1)
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template<typename T>
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struct can_pack_in_any : std::integral_constant<bool,
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(sizeof(T) <= sizeof(void*) && std::is_trivial<T>::value)> {};
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// improved to use less memory
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class packed_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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bool scalar;
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packed_any() :
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content(nullptr), scalar(false) { }
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packed_any(const packed_any& other) :
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content(!other.scalar && other.content ? other.content->clone() : other.content),
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scalar(other.scalar) { }
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template<typename T>
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packed_any(const T& value, typename std::enable_if<(can_pack_in_any<T>::value)>::type* = nullptr) :
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content(reinterpret_cast<placeholder*>(static_cast<std::size_t>(value))), scalar(true) { }
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template<typename T>
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packed_any(const T& value, typename std::enable_if<!(can_pack_in_any<T>::value)>::type* = nullptr) :
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content(new holder<T>(value)), scalar(false) { }
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~packed_any()
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{ if(!scalar && content) delete content; }
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packed_any& swap(packed_any& rhs) { std::swap(content, rhs.content); std::swap(scalar, rhs.scalar); return *this; }
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template<typename T> packed_any& operator=(const T& rhs) { packed_any(rhs).swap(*this); return *this; }
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packed_any& operator=(packed_any rhs) { rhs.swap(*this); return *this; }
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bool empty() const { return !scalar && !content; }
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template<typename T> T cast() const;
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const std::type_info& type() const {
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if(!scalar)
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return content ? content->type() : typeid(void);
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else
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return typeid(std::size_t);
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}
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};
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template<typename T>
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typename std::enable_if<can_pack_in_any<T>::value, T>::type
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packed_any_cast(const packed_any& operand) {
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assert(operand.scalar);
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union {
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T v;
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packed_any::placeholder* content;
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};
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content = operand.content;
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return v;
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}
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template<typename T>
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typename std::enable_if<!can_pack_in_any<T>::value, T>::type
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packed_any_cast(const packed_any& operand) {
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assert(operand.type() == typeid(T));
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return static_cast<packed_any::holder<T>*>(operand.content)->held;
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}
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template<typename T> T packed_any::cast() const { return packed_any_cast<T>(*this); }
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// restore memory alignment
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#pragma pack(pop)
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}
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#endif
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