functor.h

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#ifndef functor_H
#define functor_H

#include <algorithm>
#include <functional>

namespace functor{

   template <class TYPE1, class TYPE2 = TYPE1 >
   class Less_by_time
     : public std::binary_function<TYPE1,TYPE2,bool>
   {
   public:

     inline bool operator() ( TYPE1 obj1 , TYPE2 obj2 ) const
     {
      return
        ( !obj1 ) ? true  :
        ( !obj2 ) ? false : obj1->timestamp() < obj2->timestamp();
     }
   };

};// fun

#endif

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