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// compare_patterns.h -*-c++-*-
//
// Copyright (C) 2008 Daniel Burrows
//
// This program 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.
//
// This program 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 this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#ifndef EQUAL_H
#define EQUAL_H
/** \file compare_patterns.h */
#include <cwidget/generic/util/ref_ptr.h>
namespace aptitude
{
namespace matching
{
class pattern;
/** \brief Compare two patterns.
*
* The comparison is strictly syntactic; no effort is made to
* test patterns for equivalence (which is good, since I don't
* believe that it would be possible, even in principle, to do
* so).
*
* The motivation behind this function is a desire to write test
* cases for the pattern parser.
*
* \return a number less than zero if p1 is less than p2, a
* number greater than zero if p1 is greater than p2, and zero if
* p1 equals p2.
*/
int compare_patterns(const cwidget::util::ref_ptr<pattern> &p1,
const cwidget::util::ref_ptr<pattern> &p2);
}
}
#endif // EQUAL_H
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