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00001 #ifndef CommonTools_Utils_PointerComparator_h 00002 #define CommonTools_Utils_PointerComparator_h 00003 00014 #include "FWCore/Utilities/interface/EDMException.h" 00015 00016 template<typename C> 00017 struct PointerComparator { 00018 typedef typename C::first_argument_type first_argument_type; 00019 typedef typename C::second_argument_type second_argument_type; 00020 bool operator()( const first_argument_type * t1, const second_argument_type * t2 ) const { 00021 if ( t1 == 0 || t2 == 0 ) 00022 throw edm::Exception( edm::errors::NullPointerError ) 00023 << "PointerComparator: passed null pointer."; 00024 return cmp( *t1, *t2 ); 00025 } 00026 C cmp; 00027 }; 00028 00029 00030 #endif
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