error C2065:'_Ty': undeclared identifier

When I try to compile my code written in C++ .NET, I get the error message in the title of the question.

Here's the code I can't compile (I've put the following comment in front of the "wrong" line
//999 ->Here's the line incriminated!!!
to help you identify the line that doesn't compile...

Is someone has ant idea??? (Thanks in advance...)

#include "resource.h"
#include "cTimeCode.h"

class cEvent
  cTimeCode Tc;
  wstring Comment;
  typedef cEvent* Ptr;

  virtual ~cEvent();

  void set(cTimeCode tc,wstring comment);
  void print();

  cTimeCode tc();
  wstring comment();

  void createComment(
    cUnknownPtr<IAAFDictionary> pDictionary,
    cUnknownPtr<IAAFDataDef> pDataDef,
    cUnknownPtr<IAAFSequence> pSequence);

struct std::greater<cEvent::Ptr> : binary_function<_Ty, _Ty, bool> //999 ->Here's the line incriminated!!!
  bool operator()(const _Ty& x, const _Ty& y) const
    return y->tc() > x->tc();

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>> template<>
Replace this with
template<class _Ty>

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racinecondeAuthor Commented:
Thanks rajeev. It works perfect...

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