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pairs.h

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#ifndef pairs_h
#define pairs_h

#include <string>
#include <list>

class Pairs
{
 private:

  typedef struct Pair
  {
    std::string::size_type first;  
    std::string::size_type second; 
  };

  typedef std::list<Pair> Pair_list;
  typedef std::list<Pair>::iterator Pair_list_it;

  Pair_list pairs;

 public:
  Pairs( std::string line , std::string::size_type startpos = 0);
  
  void add( std::string::size_type first,
            std::string::size_type second );

  void clear();  


  bool is_in_pair( std::string::size_type pos );
 
  void extract( std::string line, std::string::size_type startpos = 0 );

 private:

  bool is_in_pair( std::string::size_type pos,  
                   std::string::size_type pair1,
                   std::string::size_type pair2 ) const ;
};

#endif

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