/*
**	SWISH++
**	stem_word.h
**
**	Copyright (C) 1998  Paul J. Lucas
**
**	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; if not, write to the Free Software
**	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef	stem_word_H
#define	stem_word_H

// local
#include "less.h"

//*****************************************************************************
//
// SYNOPSIS
//
	struct less_stem : std::less< char const* >
//
// DESCRIPTION
//
//	A less_stem is-a less< char const* > that compares C-style strings but
//	possibly stems (suffix strips) the words before comparison.
//
//*****************************************************************************
{
	less_stem( bool stem ) : stem_func_( stem ? stem_word : no_stem ) { }

	result_type
	operator()( first_argument_type a, second_argument_type b ) const {
		return std::strcmp( stem_func_( a ), stem_func_( b ) ) < 0;
	}
private:
	char const*		(*const stem_func_)( char const *word );
	static char const*	no_stem( char const *word ) { return word; }
	static char const*	stem_word( char const *word );
};

#endif	/* stem_word_H */
/* vim:set noet sw=8 ts=8: */