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;
      };
}
#endif /* DCHAIN_SELECTIVEINSERTER_H */