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_EQUIV_H_
#define ELM_EQUIV_H_
 
#include <elm/string.h>
#include <elm/util/Pair.h>
 
namespace elm {
 
// Equiv class
template <class T>
class Equiv {
public:
    typedef T t;
    static inline bool equals(const T& v1, const T& v2) { return v1 == v2; }
    inline bool isEqual(const T& v1, const T& v2) const { return equals(v1, v2); }
    static Equiv<T> def;
};
template <class T> Equiv<T> Equiv<T>::def;
 
 
// EqualsEquiv class
template <class T>
class EqualsEquiv {
public:
    typedef T t;
    static inline int equal(const T& v1, const T& v2) { return v1.equals(v2); }
    inline bool isEqual(const T& v1, const T& v2) const { return equals(v1, v2); }
    static EqualsEquiv<T> def;
};
template <class T> EqualsEquiv<T> EqualsEquiv<T>::def;
 
 
// AssocEquiv class
template <class K, class T, class E = Equiv<K> >
class AssocEquiv {
public:
    typedef Pair<K, T> pair_t;
    typedef pair_t t;
    static inline bool equals(const pair_t& v1, const pair_t& v2) { return E::equals(v1.fst, v2. fst); }
    inline bool isEqual(const pair_t& v1, const pair_t& v2) const { return equals(v1, v2); }
    static AssocEquiv<K, T, E> def;
};
template <class K, class T, class E> AssocEquiv<K, T, E> AssocEquiv<K, T, E>::def;
 
 
// CompareEquiv class
template <class C>
class CompareEquiv: public C {
public:
    typedef typename C::t t;
    inline bool isEqual(const t& v1, const t& v2) const { return C::doCompare(v1, v2) == 0; }
    static inline bool equals(const t& v1, const t& v2) { return C::compare(v1, v2) == 0; }
};
 
} // elm
 
#endif /* ELM_EQUIV_H_ */