SymmetricPair.h

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*/
 
#ifndef AGX_SYMMETRICPAIR_H
#define AGX_SYMMETRICPAIR_H
 
#include <utility>
#include <agx/macros.h>
#include <agx/hash.h>
 
namespace agx
{
 
  template<typename T>
  class SymmetricPair : public std::pair<T, T>
  {
    public:
      SymmetricPair() : std::pair<T, T>() {}
      SymmetricPair(const T& a, const T& b) : std::pair<T, T>(a, b) {}
 
      AGX_FORCE_INLINE bool contains (const T& a ) const
      {
        return ( a == this->first || a == this->second );
      }
 
      // Hash function
      UInt32 hash() const;
  };
 
  template<typename T>
  AGX_FORCE_INLINE bool operator==(const SymmetricPair<T>& a, const SymmetricPair<T>& b)
  {
    return (a.first == b.first && a.second == b.second) || (a.first == b.second && a.second == b.first);
  }
 
  template<typename T>
  AGX_FORCE_INLINE bool operator!=(const SymmetricPair<T>& a, const SymmetricPair<T>& b)
  {
    return !(a == b);
  }
 
  template<typename T>
  AGX_FORCE_INLINE UInt32 SymmetricPair<T>::hash() const
  {
    UInt32 h1 = agx::hash(this->first);
    UInt32 h2 = agx::hash(this->second);
 
    if (h1 > h2 )
      std::swap(h1, h2);
 
    return agx::hash( h1, h2 );
  }
 
  template<typename T>
  std::ostream& operator << ( std::ostream& output, const SymmetricPair<T>& pair)
  {
    output << pair.first << " : " << pair.second;
    return output;
  }
}
 
#endif /* AGX_SYMMETRICPAIR_H */