Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference
by Nicolai M. Josuttis, Addison-Wesley, 1999
© Copyright Nicolai M. Josuttis 1999

#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <cctype>
#include "compose.hpp"
using namespace std;
using namespace boost;

int main()
    string s("Internationalization");
    string sub("Nation");

    // search substring case insensitive
    string::iterator pos;
    pos = search (s.begin(),s.end(),           // string to search in
                  sub.begin(),sub.end(),       // substring to search
                  compose_f_gx_hy(equal_to<int>(), // compar. criterion

    if (pos != s.end()) {
        cout << "\"" << sub << "\" is part of \"" << s << "\""
             << endl;