vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
/* Copyright (C) 2021 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef INCLUDED_STL_ALLOCATORS
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#define INCLUDED_STL_ALLOCATORS
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#include <memory>
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#include <type_traits>
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/**
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* Adapt a 0 A.D.-style allocator for usage in STL containers.
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* Use 'Backend' as an underlying allocator.
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*/
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template<typename T, class Backend>
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class STLAllocator
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{
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template<typename A, class B>
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friend class STLAllocator;
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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 is_always_equal = std::false_type;
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STLAllocator() : allocator(std::make_shared<Backend>())
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{
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}
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template<typename V>
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STLAllocator(const STLAllocator<V, Backend>& proxy) : allocator(proxy.allocator)
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{
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}
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template<typename V>
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struct rebind
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{
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using other = STLAllocator<V, Backend>;
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};
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T* allocate(size_t n)
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{
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return static_cast<T*>(allocator->allocate(n * sizeof(T), nullptr, alignof(T)));
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}
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void deallocate(T* ptr, const size_t n)
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{
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return allocator->deallocate(static_cast<void*>(ptr), n * sizeof(T));
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}
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private:
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std::shared_ptr<Backend> allocator;
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};
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/**
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* Proxies allocation to another allocator.
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* This allows a single allocator to serve multiple STL containers.
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*/
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template<typename T, class Backend>
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class ProxyAllocator
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{
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template<typename A, class B>
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friend class ProxyAllocator;
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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 is_always_equal = std::false_type;
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ProxyAllocator(Backend& alloc) : allocator(alloc)
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{
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}
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template<typename V>
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ProxyAllocator(const ProxyAllocator<V, Backend>& proxy) : allocator(proxy.allocator)
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{
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}
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template<typename V>
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struct rebind
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{
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using other = ProxyAllocator<V, Backend>;
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};
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T* allocate(size_t n)
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{
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return static_cast<T*>(allocator.allocate(n * sizeof(T), nullptr, alignof(T)));
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}
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void deallocate(T* ptr, const size_t n)
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{
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return allocator.deallocate(static_cast<void*>(ptr), n * sizeof(T));
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}
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private:
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Backend& allocator;
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};
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#endif // INCLUDED_STL_ALLOCATORS
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