/cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/TrigBunchCrossingTool/Root/binary_compose.h

// Dear emacs, this is -*- c++ -*-
// $Id: binary_compose.h 457114 2011-09-05 09:35:49Z krasznaa $
#ifndef TRIGBUNCHCROSSINGTOOL_BINARY_COMPOSE_H
#define TRIGBUNCHCROSSINGTOOL_BINARY_COMPOSE_H

namespace Trig {

   template< class BinaryFunction,
             class UnaryFunction1,
             class UnaryFunction2 >
   class binary_compose {

   public:
      binary_compose( BinaryFunction bfn, UnaryFunction1 ufn1,
                      UnaryFunction2 ufn2 )
         : m_bfn( bfn ), m_ufn1( ufn1 ), m_ufn2( ufn2 ) {}

      typename BinaryFunction::result_type
      operator()( const typename UnaryFunction1::argument_type& x ) {
         return m_bfn( m_ufn1( x ), m_ufn2( x ) );
      }

   private:
      BinaryFunction m_bfn;
      UnaryFunction1 m_ufn1;
      UnaryFunction2 m_ufn2;
   }; // class binary_compose

   template< class BinaryFunction,
             class UnaryFunction1,
             class UnaryFunction2 >
   binary_compose< BinaryFunction, UnaryFunction1, UnaryFunction2 >
   compose2( BinaryFunction bfn, UnaryFunction1 ufn1, UnaryFunction2 ufn2 ) {

      return binary_compose< BinaryFunction, UnaryFunction1,
                             UnaryFunction2 >( bfn, ufn1, ufn2 );
   }

} // namespace Trig

#endif // TRIGBUNCHCROSSINGTOOL_BINARY_COMPOSE_H

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