locale::operator()
Compares two basic_string objects.
template<Class CharType, class Traits, class Allocator>
bool operator()(
const basic_string<CharType, Traits, Allocator >& _Left,
const basic_string<CharType, Traits, Allocator >& _Right
) const;
Parameters
_Left
The left string._Right
The right string.
Return Value
The member function returns:
–1 if the first sequence compares less than the second sequence.
+1 if the second sequence compares less than the first sequence.
0 if the sequences are equivalent.
Remarks
The member function effectively executes:
const collate<CharType>& fac = use_fac<collate<CharType> >(*this);
return (fac.compare(_Left.begin( ),_Left.end( ),_Right.begin( ),_Right.end( )) < 0);
Thus, you can use a locale object as a function object.
Example
// locale_op_compare.cpp
// compile with: /EHsc
#include <iostream>
#include <string>
#include <locale>
int main( )
{
using namespace std;
wchar_t *sa = L"ztesting";
wchar_t *sb = L"\0x00DFtesting";
basic_string<wchar_t> a( sa );
basic_string<wchar_t> b( sb );
locale loc( "German_Germany" );
cout << loc( a,b ) << endl;
const collate<wchar_t>& fac = use_facet<collate<wchar_t> >( loc );
cout << ( fac.compare( sa, sa + a.length( ),
sb, sb + b.length( ) ) < 0) << endl;
}
0 0
Requirements
Header: <locale>
Namespace: std