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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 */
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