Re: replace string file

someone suggest use the following function, any idea on how to call it
from my function?

    void
    fillQueue(
        std::deque< char >& queue,
        std::istream& source,
        size_t targetLength )
    {
        assert( queue.size() <= targetLength ) ;
        while ( queue.size() != targetLength
                && source.peek() != EOF ) {
            queue.push_back( source.get() ) ;
        }
    }

    void
    globalSearchAndReplace(
        std::istream& source,
        std::ostream& dest,
        std::string const& search,
        std::string const& replace )
    {
        std::deque< char > window ;
        fillQueue( window, source, search.size() ) ;
        while ( window.size() != search.size() ) {
            if ( std::equal( window.begin(), window.end(),
search.begin() ) ) {
                dest << replace ;
                window.clear() ;
            } else {
                dest << window.front() ;
                window.pop_front() ;
            }
            fillQueue( window, source, search.size() ) ;
        }
        std::copy( window.begin(), window.end(),
                    std::ostream_iterator< char >( dest ) ) ;
    }