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// Boost string_algo library compare.hpp header file -------------------------//
// Copyright Pavol Droba 2002-2006.
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/ for updates, documentation, and revision history.
#ifndef BOOST_STRING_COMPARE_HPP
#define BOOST_STRING_COMPARE_HPP
#include <boost/algorithm/string/config.hpp>
#include <locale>
/*! \file
Defines element comparison predicates. Many algorithms in this library can
take an additional argument with a predicate used to compare elements.
This makes it possible, for instance, to have case insensitive versions
of the algorithms.
*/
namespace boost {
namespace algorithm {
// is_equal functor -----------------------------------------------//
//! is_equal functor
/*!
Standard STL equal_to only handle comparison between arguments
of the same type. This is a less restrictive version which wraps operator ==.
*/
struct is_equal
{
//! Function operator
/*!
Compare two operands for equality
*/
template< typename T1, typename T2 >
bool operator()( const T1& Arg1, const T2& Arg2 ) const
{
return Arg1==Arg2;
}
};
//! case insensitive version of is_equal
/*!
Case insensitive comparison predicate. Comparison is done using
specified locales.
*/
struct is_iequal
{
//! Constructor
/*!
\param Loc locales used for comparison
*/
is_iequal( const std::locale& Loc=std::locale() ) :
m_Loc( Loc ) {}
//! Function operator
/*!
Compare two operands. Case is ignored.
*/
template< typename T1, typename T2 >
bool operator()( const T1& Arg1, const T2& Arg2 ) const
{
#if defined(__BORLANDC__) && (__BORLANDC__ >= 0x560) && (__BORLANDC__ <= 0x564) && !defined(_USE_OLD_RW_STL)
return std::toupper(Arg1)==std::toupper(Arg2);
#else
return std::toupper<T1>(Arg1,m_Loc)==std::toupper<T2>(Arg2,m_Loc);
#endif
}
private:
std::locale m_Loc;
};
// is_less functor -----------------------------------------------//
//! is_less functor
/*!
Convenient version of standard std::less. Operation is templated, therefore it is
not required to specify the exact types upon the construction
*/
struct is_less
{
//! Functor operation
/*!
Compare two operands using > operator
*/
template< typename T1, typename T2 >
bool operator()( const T1& Arg1, const T2& Arg2 ) const
{
return Arg1<Arg2;
}
};
//! case insensitive version of is_less
/*!
Case insensitive comparison predicate. Comparison is done using
specified locales.
*/
struct is_iless
{
//! Constructor
/*!
\param Loc locales used for comparison
*/
is_iless( const std::locale& Loc=std::locale() ) :
m_Loc( Loc ) {}
//! Function operator
/*!
Compare two operands. Case is ignored.
*/
template< typename T1, typename T2 >
bool operator()( const T1& Arg1, const T2& Arg2 ) const
{
#if defined(__BORLANDC__) && (__BORLANDC__ >= 0x560) && (__BORLANDC__ <= 0x564) && !defined(_USE_OLD_RW_STL)
return std::toupper(Arg1)<std::toupper(Arg2);
#else
return std::toupper<T1>(Arg1,m_Loc)<std::toupper<T2>(Arg2,m_Loc);
#endif
}
private:
std::locale m_Loc;
};
// is_not_greater functor -----------------------------------------------//
//! is_not_greater functor
/*!
Convenient version of standard std::not_greater_to. Operation is templated, therefore it is
not required to specify the exact types upon the construction
*/
struct is_not_greater
{
//! Functor operation
/*!
Compare two operands using > operator
*/
template< typename T1, typename T2 >
bool operator()( const T1& Arg1, const T2& Arg2 ) const
{
return Arg1<=Arg2;
}
};
//! case insensitive version of is_not_greater
/*!
Case insensitive comparison predicate. Comparison is done using
specified locales.
*/
struct is_not_igreater
{
//! Constructor
/*!
\param Loc locales used for comparison
*/
is_not_igreater( const std::locale& Loc=std::locale() ) :
m_Loc( Loc ) {}
//! Function operator
/*!
Compare two operands. Case is ignored.
*/
template< typename T1, typename T2 >
bool operator()( const T1& Arg1, const T2& Arg2 ) const
{
#if defined(__BORLANDC__) && (__BORLANDC__ >= 0x560) && (__BORLANDC__ <= 0x564) && !defined(_USE_OLD_RW_STL)
return std::toupper(Arg1)<=std::toupper(Arg2);
#else
return std::toupper<T1>(Arg1,m_Loc)<=std::toupper<T2>(Arg2,m_Loc);
#endif
}
private:
std::locale m_Loc;
};
} // namespace algorithm
// pull names to the boost namespace
using algorithm::is_equal;
using algorithm::is_iequal;
using algorithm::is_less;
using algorithm::is_iless;
using algorithm::is_not_greater;
using algorithm::is_not_igreater;
} // namespace boost
#endif // BOOST_STRING_COMPARE_HPP
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