DOCUMENT:Q158207  29-APR-2002  [visualc]
TITLE   :STL Sample for the string::operator+ Function
PRODUCT :Microsoft C Compiler
PROD/VER::4.2,5.0,6.0
OPER/SYS:
KEYWORDS:kbcode kbVC420 kbVC500 kbVC600 kbDSupport

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The information in this article applies to:

 - The Standard C++ Library, used with:
    - Microsoft Visual C++, 32-bit Enterprise Edition, versions 4.2, 5.0, 6.0 
    - Microsoft Visual C++, 32-bit Professional Edition, versions 4.2, 5.0, 6.0 
    - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
    - Microsoft Visual C++.NET (2002) 
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SUMMARY
=======

The sample code below illustrates how to use the string::operator+ STL function
in Visual C++.

MORE INFORMATION
================

Required Header
---------------

      <string>

Prototype
---------

      Function 1:
          template<class _E, class _TYPE, class _A> inline
          basic_string<_E, _TYPE, _A>
          operator+(const basic_string<_E, _TYPE, _A>& LString,
                    const _E *RCharArray);

      Function 2:
          template<class _E, class _TYPE, class _A> inline
          basic_string<_E, _TYPE, _A>
          operator+(const _E *LCharArray,
                    const basic_string<_E, _TYPE, _A>& RString);

      Function 3:
          template<class _E, class _TYPE, class _A> inline
          basic_string<_E, _TYPE, _A>
          operator+(const basic_string<_E, _TYPE, _A>& LString,
                    const _E RChar);

      Function 4:
          template<class _E, class _TYPE, class _A> inline
          basic_string<_E, _TYPE, _A>
          operator+(const _E LChar,
                    const basic_string<_E, _TYPE, _A>& RString);

      Function 5:
          template<class _E, class _TYPE, class _A> inline
          basic_string<_E, _TYPE, _A>
          operator+(const basic_string<_E, _TYPE, _A>& LString,
                    const basic_string<_E, _TYPE, _A>& RString);

NOTE: The class/parameter names in the prototype may not match the version in the
header file. Some have been modified to improve readability.

Description:
------------

There are five versions of the string::operator+ function. Two functions are used
to concatenate a null-terminated character array and a basic_string. Two
functions are used to concatenate a character and a basic_string. The last
function is used to concatenate two basic_string variables.

Sample Code
-----------

   ////////////////////////////////////////////////////////////////////// 
   // 
   // Compile options needed: /GX
   // 
   // StringPlus.cpp : Illustrates how to use the operator+ to concatenate
   //                  a null-terminated character array and a basic_string,
   //                  how to concatenate a character and a basic_string,
   //                  and how to concatenate two basic_string variables.
   // 
   // Functions:
   // 
   //    operator+ : Concatenates a null-terminated character array and
   //                a basic_string.
   //    operator+ : Concatenates a character array and a basic_string.
   //    operator+ : Concatenates two basic_string variables.
   // 
   // Written by Derek Jamison
   // of Microsoft Product Support Services,
   // Copyright (c) 1996 Microsoft Corporation. All rights reserved.
   ////////////////////////////////////////////////////////////////////// 

   #pragma warning(disable:4786)
   #include <string>
   #include <iostream>
   using namespace std;

   #if _MSC_VER > 1020   // if VC++ version is > 4.2
      using namespace std;  // std c++ libs implemented in std
      #endif

   void main()

   {

      string result;
      string S1="ABC";
      string S2="DEF";
      char CP1[]="GHI";
      char C='J';

      cout << "S1 is " << S1 << endl;
      cout << "S2 is " << S2 << endl;
      cout << "CP1 is " << CP1 << endl;
      cout << "C is " << C << endl;

      result=S1+CP1;                           // Function 1  (ABCGHI)
      cout << "S1+CP1 is " << result << endl;

      result=CP1+S1;                           // Function 2  (GHIABC)
      cout << "CP1+S1 is " << result << endl;

      result=S1+S2;                            // Function 3  (ABCDEF)
      cout << "S1+S2 is " << result << endl;

      result=S1+C;                             // Function 4  (ABCJ)
      cout << "S1+C is " << result << endl;

      result=C+S1;                             // Function 5  (JABC)
      cout << "C+S1 is " << result << endl;

   }

Program Output is:

   S1 is ABC
   S2 is DEF
   CP1 is GHI
   C is J
   S1+CP1 is ABCGHI
   CP1+S1 is GHIABC
   S1+S2 is ABCDEF
   S1+C is ABCJ
   C+S1 is JABC

REFERENCES
==========

Visual C++ Books On Line: Visual C++ Books:C/C++:Standard C++ Library Reference.

Additional query words: STL STLSample operator+ string

======================================================================
Keywords          : kbcode kbVC420 kbVC500 kbVC600 kbDSupport 
Technology        : kbVCsearch kbAudDeveloper kbVCLibrary
Version           : :4.2,5.0,6.0
Issue type        : kbinfo

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