Allocator class

Allocator.hpp

class Allocator {
public:
	virtual std::size_t get_num_allocations() const=0;
	virtual std::size_t get_allocation_size(void* p) const=0;
	virtual void* allocate(std::size_t size, std::size_t align=0)=0;
	virtual void deallocate(void* p)=0;

	template<class U, typename ...Args>
	inline U* construct(Args&&... args) {
		return new (allocate(sizeof(U), alignof(U))) U(std::forward<Args>(args)...);
	}
	template<class U>
	inline void destruct(U* p) {
		if (p) {
			p->~U();
			deallocate(p);
		}
	}
};