ex9_44.cpp

//
//  ex9_44.cpp
//  Exercise 9.44
//
//  Created by pezy on 12/4/14.
//  Copyright (c) 2014 pezy. All rights reserved.
//
//  @Brief  Rewrite the previous function using an index and replace.
//  @See    9.43

#include <iostream>
#include <string>

using std::cout;
using std::endl;
using std::string;
using std::prev;

void Replace(string& s, string const& oldVal, string const& newVal)
{
    for (string::size_type i = 0; i != s.size(); ++i)
        if (s.substr(i, oldVal.size()) == oldVal) {
            s.replace(i, oldVal.size(), newVal);
            i += newVal.size() - 1;
        }
}

int main()
{
    string str{"To drive straight thru is a foolish, tho courageous act."};
    Replace(str, "tho", "though");
    Replace(str, "thru", "through");
    cout << str << endl;
}