98 lines
3.4 KiB
C++
98 lines
3.4 KiB
C++
/**
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This file is a part of rexy's general purpose library
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Copyright (C) 2022 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef REXY_STORAGE_FOR_HPP
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#define REXY_STORAGE_FOR_HPP
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#include <utility> //forward, move
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#include <type_traits> //is_nothrow_constructible, etc
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#include "compat/standard.hpp"
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namespace rexy{
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//A wrapper around raw storage.
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//Allows default constructing objects with members which cannot be default constructed
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template<class T>
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class storage_for
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{
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public:
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using value_type = T;
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using pointer = T*;
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using const_pointer = const T*;
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using reference = T&;
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using const_reference = const T&;
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using rvalue_reference = T&&;
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static constexpr auto align = alignof(value_type);
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static constexpr auto size = sizeof(value_type);
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private:
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#if __cplusplus >= 202002L && __has_cpp_attribute(no_unique_address) && __cpp_constexpr >= 202002L
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union storage_{
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[[no_unique_address]]
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struct empty_{}empty = {};
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T data;
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}m_storage;
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#else //__cplusplus
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alignas(align) unsigned char m_storage[size];
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#endif //__cplusplus
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unsigned char m_dirty:1 = 0;
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public:
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constexpr storage_for(void) = default;
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template<class... Args>
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constexpr storage_for(Args&&... args)noexcept(std::is_nothrow_constructible<value_type,Args...>::value);
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constexpr storage_for(const_reference t)noexcept(std::is_nothrow_copy_constructible<value_type>::value);
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constexpr storage_for(rvalue_reference t)noexcept(std::is_nothrow_move_constructible<value_type>::value);
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constexpr storage_for(const storage_for& s)noexcept(std::is_nothrow_copy_constructible<value_type>::value);
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constexpr storage_for(storage_for&& s)noexcept(std::is_nothrow_move_constructible<value_type>::value);
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REXY_CPP20_CONSTEXPR ~storage_for(void)noexcept(std::is_nothrow_destructible<value_type>::value);
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constexpr storage_for& operator=(const storage_for& s)noexcept(std::is_nothrow_copy_assignable<value_type>::value);
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constexpr storage_for& operator=(storage_for&& s)noexcept(std::is_nothrow_move_assignable<value_type>::value);
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constexpr storage_for& operator=(const_reference t)noexcept(std::is_nothrow_copy_assignable<value_type>::value);
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constexpr storage_for& operator=(rvalue_reference t)noexcept(std::is_nothrow_move_assignable<value_type>::value);
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constexpr void destroy(void)noexcept(std::is_nothrow_destructible<value_type>::value);
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constexpr operator reference(void)noexcept;
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constexpr operator const_reference(void)const noexcept;
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constexpr operator rvalue_reference(void)&& noexcept;
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constexpr reference get(void)noexcept;
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constexpr const_reference get(void)const noexcept;
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constexpr pointer operator->(void)noexcept;
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constexpr const_pointer operator->(void)const noexcept;
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constexpr reference operator*(void)noexcept;
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constexpr const_reference operator*(void)const noexcept;
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constexpr bool valid(void)const;
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};
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}
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#include "storage_for.tpp"
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#endif
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