JHashEvaluator.hh

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#ifndef __JTOOLS__JHASHEVALUATOR__
#define __JTOOLS__JHASHEVALUATOR__
 
 
/**
 * \author mdejong
 */
 
namespace JTOOLS {}
namespace JPP { using namespace JTOOLS; }
 
namespace JTOOLS {
 
  /**
   * Auxiliary class for default hash key evaluation.
   *
   * For a composite hash key, the following policy member method should be provided.
   * <pre>
   *    int %getID() const;
   * </pre>
   *
   * For integral primitive data types, the hash value is obtained by a simple cast to an <tt>int</tt> value.
   */
  struct JHashEvaluator {
    /**
     * Get hash value.
     *
     * \param  key             key
     * \return                 hash value
     */
    template<class JKey_t>
    inline int operator()(const JKey_t& key) const
    {
      return key.getID();
    }
 
    inline int operator()(const char key) const                   { return (int) key; }  //!< Get hash value.
    inline int operator()(const unsigned char key) const          { return (int) key; }  //!< Get hash value.
    inline int operator()(const short key) const                  { return (int) key; }  //!< Get hash value.
    inline int operator()(const unsigned short key) const         { return (int) key; }  //!< Get hash value.
    inline int operator()(const int key) const                    { return (int) key; }  //!< Get hash value.
    inline int operator()(const unsigned int key) const           { return (int) key; }  //!< Get hash value.
    inline int operator()(const long int key) const               { return (int) key; }  //!< Get hash value.
    inline int operator()(const unsigned long int key) const      { return (int) key; }  //!< Get hash value.
    inline int operator()(const long long int key) const          { return (int) key; }  //!< Get hash value.
    inline int operator()(const unsigned long long int key) const { return (int) key; }  //!< Get hash value.
  };
}
 
#endif