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/* Copyright (C) 2025 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef INCLUDED_STL_ALLOCATORS
#define INCLUDED_STL_ALLOCATORS
#include <cstddef>
#include <memory>
#include <type_traits>
/**
* Adapt a 0 A.D.-style allocator for usage in STL containers.
* Use 'Backend' as an underlying allocator.
*/
template<typename T, class Backend>
class STLAllocator
{
template<typename A, class B>
friend class STLAllocator;
public:
using value_type = T;
using pointer = T*;
using is_always_equal = std::false_type;
STLAllocator() : allocator(std::make_shared<Backend>())
{
}
template<typename V>
STLAllocator(const STLAllocator<V, Backend>& proxy) : allocator(proxy.allocator)
{
}
template<typename V>
struct rebind
{
using other = STLAllocator<V, Backend>;
};
T* allocate(size_t n)
{
return static_cast<T*>(allocator->allocate(n * sizeof(T), alignof(T)));
}
void deallocate(T* ptr, const size_t n)
{
return allocator->deallocate(static_cast<void*>(ptr), n * sizeof(T));
}
private:
std::shared_ptr<Backend> allocator;
};
/**
* Proxies allocation to another allocator.
* This allows a single allocator to serve multiple STL containers.
*/
template<typename T, class Backend>
class ProxyAllocator
{
template<typename A, class B>
friend class ProxyAllocator;
public:
using value_type = T;
using pointer = T*;
using is_always_equal = std::false_type;
ProxyAllocator(Backend& alloc) : allocator(alloc)
{
}
template<typename V>
ProxyAllocator(const ProxyAllocator<V, Backend>& proxy) : allocator(proxy.allocator)
{
}
template<typename V>
struct rebind
{
using other = ProxyAllocator<V, Backend>;
};
T* allocate(size_t n)
{
return static_cast<T*>(allocator.allocate(n * sizeof(T), alignof(T)));
}
void deallocate(T* ptr, const size_t n)
{
return allocator.deallocate(static_cast<void*>(ptr), n * sizeof(T));
}
template<typename V>
bool operator==(const ProxyAllocator<V, Backend>& other) const
{
return std::addressof(allocator) == std::addressof(other.allocator);
}
template<typename V>
bool operator!=(const ProxyAllocator<V, Backend>& other) const
{
return std::addressof(allocator) != std::addressof(other.allocator);
}
private:
Backend& allocator;
};
#endif // INCLUDED_STL_ALLOCATORS
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