Event/DecayChain/include/DecayChain/Iterator/SelectiveInserter.h

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#ifndef DCHAIN_SELECTIVEINSERTER_H
#define DCHAIN_SELECTIVEINSERTER_H
// -*- C++ -*-
//
// Package:     <DChain>
// Module:      SelectiveInserter
//
/**\class SelectiveInserter SelectiveInserter.h DChain/SelectiveInserter.h
 
 Description: Inserts objects into a list only if those object pass the selection
 
 Usage:
    <usage>
 
*/
//
// Author:      Chris D Jones
// Created:     Thu Jan  5 15:40:59 EST 2006
// $Id: SelectiveInserter.h,v 1.1.1.1 2009/03/03 06:06:56 maqm Exp $
//
// Revision history
//
// $Log: SelectiveInserter.h,v $
// Revision 1.1.1.1  2009/03/03 06:06:56  maqm
// first import of DecayChain
//
// Revision 1.1  2006/01/11 20:28:18  cdj
// massive class renaming, addition of [] for selection and unit tests
//
 
// system include files
#include <iterator>
 
// user include files
 
// forward declarations
namespace dchain {
  template <class TList, class TSelect> struct SelectiveInserter {
    typedef std::output_iterator_tag iterator_category;
    typedef void                     value_type;
    typedef void                     difference_type;
 
    SelectiveInserter( TList& iList, const TSelect& iSelect )
        : m_list( &iList ), m_select( iSelect ) {}
    SelectiveInserter<TList, TSelect>& operator*() { return *this; }
 
    SelectiveInserter<TList, TSelect>& operator++() { return *this; }
 
    SelectiveInserter<TList, TSelect>& operator+( int ) { return *this; }
 
    /// returns false if object not added to list
    template <class THolder> bool operator=( THolder iHolder ) {
      return m_list->attempt_insert( iHolder, m_select );
    }
 
  private:
    TList*  m_list;
    TSelect m_select;
  };
} // namespace dchain
#endif /* DCHAIN_SELECTIVEINSERTER_H */