iter3.cpp

stl自带源码

/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 *
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#include <string>
#include <iostream>
#include <algorithm>
using namespace std;

int main()
{
    // create constant string
    const string hello("Hello, how are you?");

    // initialize string s with all characters of string hello
    string s(hello.begin(),hello.end());

    // iterate through all of the characters
    string::iterator pos;
    for (pos = s.begin(); pos != s.end(); ++pos) {
        cout << *pos;
    }
    cout << endl;

    // reverse the order of all characters inside the string
    reverse (s.begin(), s.end());
    cout << "reverse:       " << s << endl;

    // sort all characters inside the string
    sort (s.begin(), s.end());
    cout << "ordered:       " << s << endl;

    /* remove adjacent duplicates
     * - unique() reorders and returns new end
     * - erase() shrinks accordingly
     */
    s.erase (unique(s.begin(),
                    s.end()),
             s.end());
    cout << "no duplicates: " << s << endl;
}