allocator implementation

[George2]

Hello everyone,


I have debugged into STL implementation for allocator in file xmemory (Visual Studio 2008). I found it has not data members, the same as its base class _Allocator_base. Is that correct?

http://msdn2.microsoft.com/en-us/library/6s8wyf7c.aspx

My questions is what is the purpose of copy? It always returns true. Here is the code,

you can see do nothing for copy constructor as well.

allocator(const allocator<_Ty>&) _THROW0()
{
    // construct by copying (do nothing)
}

		// allocator TEMPLATE OPERATORS
template<class _Ty,
	class _Other> inline
	bool operator==(const allocator<_Ty>&, const allocator<_Other>&) _THROW0()
	{	// test for allocator equality (always true)
	return (true);
	}

thanks in advance,
George