The following sample code illustrates how to use the
string::operator>= STL function in Visual C++.
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Required Header
<string>
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Prototype
Function 1:
template<class _E, class _TYPE, class _A> inline
bool operator>=(const basic_string<_E, _TYPE, _A>& _L,
const _E *_R);
Function 2:
template<class _E, class _TYPE, class _A> inline
bool operator>=(const _E * _L,
const basic_string<_E, _TYPE, _A>& _R);
: The class/parameter names in the prototype may not match the
version in the header file. Some have been modified to improve readability.
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Description
There are two versions of the string::operator>= function.
Both versions are used to compare a null-terminated character array against a
basic_string. They perform this operation by negating the result of (_L <
_R). For more information on this comparison, please see the
string::operator< function.
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Sample Code
//////////////////////////////////////////////////////////////////////
//
// Compile options needed: none
//
// StringGreaterEqual.cpp:
// Illustrates how to use the operator>= to compare a
// basic_string variable and a null-terminated string.
//
// Functions:
//
// operator>= Returns true if the first parameter is not less than
// the second.
//
// Written by Derek Jamison
// of Microsoft Technical Support,
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
//////////////////////////////////////////////////////////////////////
#pragma warning(disable:4786)
#include <string>
#include <iostream>
#if _MSC_VER > 1020 // if VC++ version is > 4.2
using namespace std; // std c++ libs implemented in std
#endif
void truefalse(int x)
{
cout << (x?"True":"False") << endl;
}
void main()
{
string S1="ABC";
char CP1[4]="ABC";
char CP2[4]="DEF";
cout << "S1 is " << S1 << endl;
cout << "CP1 is " << CP1 << endl;
cout << "CP2 is " << CP2 << endl;
cout << "S1>=CP1 returned ";
truefalse(S1>=CP1); // True (calls function 1)
cout << "S1>=CP2 returned ";
truefalse(S1>=CP2); // False (calls function 1)
cout << "CP1>=S1 returned ";
truefalse(CP1>=S1); // True (calls function 2)
cout << "CP2>=S1 returned ";
truefalse(CP2>=S1); // True (calls function 2)
}
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Program Output
S1 is ABC
CP1 is ABC
CP2 is DEF
S1>=CP1 returned True
S1>=CP2 returned False
CP1>=S1 returned True
CP2>=S1 returned True
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Visual C++ Books Online: Visual C++ Books; C/C++; Standard
C++ Library Reference
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