INFO: STL Sample for the basic_string::append Functions

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