Re: Make STL containers allocate aligned memory

On Nov 26, 4:42 pm, zr <zvir...@gmail.com> wrote:


Why?


It is probably provided by a library shipped with the compiler, not by
compiler itself.


Something like this:

#include <memory>
#include <stdexcept>

template<class T, size_t alignment>
struct aligned_allocator : std::allocator<T>
{
    template<class U>
    struct rebind { typedef aligned_allocator<U, alignment> other; };

    typedef std::allocator<T> base;

    typedef typename base::pointer pointer;
    typedef typename base::size_type size_type;

    pointer allocate(size_type n)
    {
        if(pointer p = (pointer)aligned_malloc(n, alignment))
            return p;
        throw std::bad_alloc("aligned_allocator");
    }

    pointer allocate(size_type n, void const*)
    {
        return this->allocate(n);
    }

    void deallocate(pointer p, size_type)
    {
        aligned_free(p);
    }
};

--
Max