C++ Rewrite a file but leaving out everything before a word

Question

I\'m using Visual C++ Express 2010... and I\'m very new to C++.

I want to read a file then remove everything before the word \"<--START-->\" and rewrite the file

Answer 1

Well, there are a lot of answers here already, but here's another. It's very short because it's super simple, it's one-pass, perfectly portable, and it doesn't allocate anything on the heap.

#include 
#include 
#include 

void strip_file_beginning( std::istream &in_s, std::ostream &out_s ) {
    std::istreambuf_iterator< char > in( in_s ), in_end;
    std::ostreambuf_iterator< char > out( out_s );
    static char const start_word[] = "<--START-->"; // mind the terminating '\0'

    for ( char const *pen = start_word; pen != start_word + sizeof start_word - 1
                                  && in != in_end; ++ in ) {
        if ( * in == * pen ) ++ pen;
        else pen = start_word;
    }

    std::copy( in, in_end, out );
}

http://ideone.com/zh9bd