mirror of
https://gitea.wildfiregames.com/0ad/0ad
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157c6af18e
Avoid cases of filenames Update years in terms and other legal(ish) documents Don't update years in license headers, since change is not meaningful Will add linter rule in seperate commit Happy recompiling everyone! Original Patch By: Nescio Comment By: Gallaecio Differential Revision: D2620 This was SVN commit r27786.
116 lines
2.9 KiB
C++
116 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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