itkStructHashFunction.h

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#ifndef ITKSTRUCTHASHFUNCTION_H
#define ITKSTRUCTHASHFUNCTION_H

namespace itk
{

template< class TInput >
class StructHashFunction
{
public:

  typedef StructHashFunction Self;

  typedef TInput InputType;

  unsigned int operator()( const InputType& key ) const;

};

template< class TInput >
inline unsigned int
StructHashFunction< TInput >
::operator()( const InputType& key ) const
{
  int len = sizeof( InputType );
  const char* p = reinterpret_cast< const char* >( &key );
  int hash = 0;
  while( len-- )
    {
    hash = hash * 65 + *p++;
    }
  hash += (hash >> 5);
  return hash;
}

}

#endif  // ndef ITKSTRUCTHASHFUNCTION_H

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