CWE-ou-minkata/Sources/Plasma/CoreLib/hsAlignedAllocator.hpp

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*==LICENSE==*/

#ifndef _HS_ALIGNED_ALLOCATOR_H
#define _HS_ALIGNED_ALLOCATOR_H

#include "HeadSpin.h"

template<class T, size_t ALIGNMENT=16>

/**
 * An aligned allocator for storing SIMD ready values in STL containers
 * \remarks Based on https://gist.github.com/donny-dont/1471329
 */
class hsAlignedAllocator
{
    hsAlignedAllocator& operator=(const hsAlignedAllocator&) { }

public:
    template <typename U, size_t ALIGNMENT=16>
    struct rebind
    {
        typedef hsAlignedAllocator<U, ALIGNMENT> other;
    };

    typedef T* pointer;
    typedef const T* const_pointer;
    typedef T& reference;
    typedef const T& const_reference;
    typedef T value_type;
    typedef size_t size_type;
    typedef ptrdiff_t difference_type;

    hsAlignedAllocator() { }
    hsAlignedAllocator(const hsAlignedAllocator&) { }
    template <typename U> hsAlignedAllocator(const hsAlignedAllocator<U, ALIGNMENT>&) { }
    ~hsAlignedAllocator() { }

    pointer address(reference r) const { return &r; }
    const_pointer address(const_reference r) const { return &r; }

    pointer allocate(size_type size, const_pointer hint=nullptr)
    {
        if (size == 0)
            return nullptr;
        if (size > max_size())
            throw std::length_error("integer overflow");

#ifdef HS_BUILD_FOR_WIN32
        void* ptr = _aligned_malloc(size * sizeof(value_type), ALIGNMENT);
#else
        void* ptr = nullptr;
        posix_memalign(&ptr, ALIGNMENT, size * sizeof(value_type));
#endif // HS_BUILD_FOR_WIN32

        if (!ptr)
            throw std::bad_alloc();
        return static_cast<pointer>(ptr);
    }

    void construct(T* const p, const_reference t) const
    {
        void * const pv = static_cast<void *>(p);
        new (pv) value_type(t);
    }


    void deallocate(pointer ptr, size_type size)
    {
#ifdef HS_BUILD_FOR_WIN32
        _aligned_free(ptr);
#else
        free(ptr);
#endif // HS_BUILD_FOR_WIN32
    }

    void destroy(T* const p) const
    {
        p->~T();
    }

    size_type max_size() const
    {
        return static_cast<size_t>(-1) / sizeof(value_type);
    }

    bool operator==(const hsAlignedAllocator& other) const { return true; }
};

#endif // _HS_ALIGNED_ALLOCATOR_H