Q157972: STL Sample for the basic_string::append Functions

Article: Q157972
Product(s): Microsoft C Compiler
Version(s): 4.2,5.0,6.0
Operating System(s): 
Keyword(s): kbcode kbVC420 kbVC500 kbVC600 kbDSupport
Last Modified: 27-MAR-2002

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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 basic_string::append STL
functions in Visual C++.

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

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

    <xstring>

Prototypes
----------

     basic_string& append(const basic_string& _X);

     basic_string& append(const basic_string& _X, size_type pos,

                          size_type count);

     basic_string& append(const element_type *_S, size_type count);

     basic_string& append(const element_type *_S);

     basic_string& append(size_type count, element_type _C);

     basic_string& append(Iterator first, Iterator last);

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

Description
-----------

The append member functions of the basic_string append elements to the end of the
string. The different forms of the function provide alternate ways to specify
the source of the elements that will be appended.

The append functions return a reference to the string to which the elements were
appended.

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

  ////////////////////////////////////////////////////////////////////// 
  // 
  // Compile options needed: /GX
  // 
  // bsappend.cpp : Illustrates how to use the basic_string append member
  //                function.
  // 
  // Functions:
  // 
  //    basic_string::append - appends a sequence of elements to the
  //                           current string.
  // 
  // Written by Michael Reeves
  // of Microsoft Product Support Services,
  // Copyright (c) 1996 Microsoft Corporation. All rights reserved.
  ////////////////////////////////////////////////////////////////////// 

  #include <xstring>
  #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

  typedef basic_string<char, char_traits<char>,

                       allocator<char> > test_string;

  void main()

  {

      test_string str1("012");
      test_string str2("345");

      cout << "str1 = " << str1.c_str() << endl;

      // append str2 to str1
      str1.append(str2);

      cout << "str1 = " << str1.c_str() << endl;

      // append the last 2 items in str2 to str1
      str2 = "567";
      str1.append(str2, 1, 2);    // begin at pos 1, append 2 elements

      cout << "str1 = " << str1.c_str() << endl;

      // append the first 2 items from an array of the element type
      char achTest[] = {'8', '9', 'A'};
      str1.append(achTest, 2);

      cout << "str1 = " << str1.c_str() << endl;

      // append all of a string literal to str1
      char szTest[] = "ABC";
      str1.append(szTest);

      cout << "str1 = " << str1.c_str() << endl;

      // append one item of the element type
      str1.append(1, 'D');

      cout << "str1 = " << str1.c_str() << endl;

      // append str2 to str1 using iterators
      str2 = "EF";
      str1.append (str2.begin(), str2.end());

      cout << "str1 = " << str1.c_str() << endl;

  }

Program Output is:

  str1 = 012
  str1 = 012345
  str1 = 01234567
  str1 = 0123456789
  str1 = 0123456789ABC
  str1 = 0123456789ABCD
  str1 = 0123456789ABCDEF

REFERENCES
==========

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

Additional query words: STL STLSample basic_string::append

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

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