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

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

namespace Trig {

   template< class UnaryFunction1,
             class UnaryFunction2 >
   class unary_compose {

   public:
      unary_compose( UnaryFunction1 ufn1, UnaryFunction2 ufn2 )
         : m_ufn1( ufn1 ), m_ufn2( ufn2 ) {}

      typename UnaryFunction1::result_type
      operator()( const typename UnaryFunction2::argument_type& x ) {
         return m_ufn1( m_ufn2( x ) );
      }

   private:
      UnaryFunction1 m_ufn1;
      UnaryFunction2 m_ufn2;

   }; // class unary_compose

   template< class UnaryFunction1,
             class UnaryFunction2 >
   unary_compose< UnaryFunction1, UnaryFunction2 >
   compose1( UnaryFunction1 ufn1, UnaryFunction2 ufn2 ) {

      return unary_compose< UnaryFunction1,
                            UnaryFunction2 >( ufn1, ufn2 );
   }

} // namespace Trig

#endif // TRIGBUNCHCROSSINGTOOL_UNARY_COMPOSE_H

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