File: less.h

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/*
**	SWISH++
**	less.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	less_H
#define	less_H

// standard
#include <cstring>
#include <functional>

// local
#include "fake_ansi.h"

//*****************************************************************************
//
// SYNOPSIS
//
	template<> struct less< char const* > :
		binary_function< char const*, char const*, bool >
//
// DESCRIPTION
//
//	Specialize the binary_function "less" so that C-style strings (char
//	const*) will work properly with STL containers.
//
// SEE ALSO
//
//	binary_function(3), less(3), strcmp(3)
//
//	Stroustrup, Bjarne.  "The C++ Programming Language, 3rd ed."
//	Addison-Wesley, Reading, MA.  p. 468.
//
//*****************************************************************************
{
	bool operator()( char const *a, char const *b ) const {
		return std::strcmp( a, b ) < 0;
	}
};

//*****************************************************************************
//
// SYNOPSIS
//
	template< class T > struct less_n;

	template<> struct less_n< char const* > : less< char const* >
//
// DESCRIPTION
//
//	This binary_function is a variant of less< char const* > that
//	compares C-style strings but only for a certain maximum length.
//
// SEE ALSO
//
//	less(3), strncmp(3)
//
//*****************************************************************************
{
	less_n< char const* >( int len ) : n_( len ) { }
	bool operator()( char const *a, char const *b ) const {
		return std::strncmp( a, b, n_ ) < 0;
	}
private:
	int const n_;
};

#endif	/* less_H */