Equiv.h

/*
 *  $Id$
 *  Equiv class interface
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2008, IRIT UPS.
 * 
 *  OTAWA is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  OTAWA is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with OTAWA; if not, write to the Free Software 
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef ELM_UTIL_EQUIV_H_
#define ELM_UTIL_EQUIV_H_

#include <elm/string.h>
#include <elm/util/Pair.h>

namespace elm {

// Equiv class
template <class T>
class Equiv {
public:
    static inline bool equals(const T& v1, const T& v2) { return v1 == v2; }
};

// EqualsEquiv class
template <class T>
class EqualsEquiv {
public:
    static inline int compare(const T& v1, const T& v2)
        { return v1.equals(v2); }
};


// AssocEquiv class
template <class K, class T, class E = Equiv<K> >
class AssocEquiv {
public:
    typedef Pair<K, T> pair_t;
    static inline bool equals(const pair_t& v1, const pair_t& v2)
        { return E::equals(v1.fst, v2. fst); }
};
template <class K, class T> class Equiv<Pair<K, T> >
    : public AssocEquiv<K, T> { };

} // elm

#endif /* ELM_UTIL_EQUIV_H_ */