Pair.h

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/************************************************************************
 * Pair.h: definition of pairs for dictionaries and sets.
************************************************************************/

#if defined(external_templates)
#pragma interface
#endif

#if !defined(_Pair_h_)
#define _Pair_h_

//#ifdef STL...
//#include <stl.h>
//#else

/************************************************************************
 * template<class T1, class T2> struct pdpair
************************************************************************/

// Note that pdpaired classes must provide operator== and operator<

template<class T1, class T2>
struct pdpair {
 public: //needed so nt build doesn't think members are private
  T1 first;
  T2 second;

  bool operator==(const pdpair<T1, T2>& p) {
    return (first == p.first) && (second == p.second); 
  }
  bool operator!=(const pdpair<T1, T2>& p) {
    return !((first == p.first) && (second == p.second));
  }
  /*
  bool operator<(const pdpair<T1, T2>& p) { 
    return (first < p.first) || (!(p.first < first) && second < p.second); 
  }
  bool operator>(const pdpair<T1, T2>& p) {
    return (p.first < first) || (!(first < p.first) && p.second < second);
  }
  */
  pdpair () : first(), second()                                    {}
  pdpair (const T1& k) : first(k), second(0)                       {}
  pdpair (const T1& k, const T2& v) : first(k), second(v)          {}
  pdpair(const pdpair<T1, T2>& p) : first(p.first), second(p.second) {}
};

// Return a T1 pair containing the min and max elements of a  vector of
// type T2<T1>. If the vector contains no elements a 0,0 pair is returned.
template <class T1, class T2>
pdpair<T1, T1> min_max_pdpair (const T2 & vect)
{
    if (vect.size() == 0) {
    T1 def = 0;
    return pdpair<T1,T1>(def, def);
    }

    if (vect.size() == 1) {
    return pdpair<T1,T1>(vect[0], vect[0]);
    }
    
    T1 min = vect[0];
    T1 max = vect[0];
  
    for (unsigned int i = 0; i < vect.size (); i++) {
    if (vect[i] < min)
        min = vect[i];
    
    if (vect[i] > max)
        max = vect[i];
    }
    
    return pdpair<T1,T1>(min, max);
}

//#endif

#endif /* !defined(_PDPair_h_) */