Boost C++ Libraries

...one 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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tools/build/v2/example/customization/codegen.cpp

// (C) Copyright Vladimir Prus, 2003
// 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.

// Please see 'usage.verbatim' file for usage notes.

#include <iostream>
#include <string>
#include <cstring>
using std::cout;
using std::string;
using std::strlen;

extern const char class_template[];
extern const char usage[];

int main(int ac, char* av[])
{
    if (av[1]) {        

        string class_name = av[1];
        string s = class_template;
        
        string::size_type n;
        while((n = s.find("%class_name%")) != string::npos) {
            s.replace(n, strlen("%class_name%"), class_name);
        }
        std::cout << "Output is:\n";
        std::cout << s << "\n";        
        return 0;
    } else {
        std::cout << usage << "\n";
        return 1;
    }
}