essentially a copy of this StackOverflow question.
To quote N4606:
virtual void* do_allocate(size_t bytes, size_t alignment) = 0;
Requires: Alignment shall be a power of two.
Returns: A derived class shall implement this function to return a pointer to allocated storage (3.7.4.2) with a size of at least bytes. The returned storage is aligned to the specified alignment, if such alignment is supported; otherwise it is aligned to max_align.
Throws: A derived class implementation shall throw an appropriate exception if it is unable to allocate memory with the requested size and alignment.
This is ambiguous: What happens if the alignment is a power of two but unsupported (e.g larger than max_align)? Is the returned storage aligned to max_align or is an exception thrown?
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