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George2 02-27-2008 08:51 AM

struct inside a class
 
Hello everyone,


For the MSDN sample,

http://msdn2.microsoft.com/en-us/library/2af6btx2.aspx

Code:

  template <class U>
      struct rebind { typedef stingyallocator<U> other; };

My question is, what is the purpose of defining an internal struct which has only a type? How to use it? Why class U is different from _Ty?

(I see similar code in STL internal implementation for allocator class, seems like a pattern which I do not know.)


thanks in advance,
George


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