C++ :: Output To Console And Log File

I have 18,000 lines of code that i would like to upgrade to include a log file. I want to replace the cout with a stream or something similar so that i can easily output to the console and to a log file at the same time with minimal change to 18,000 lines of code. I'm nearly there.

I used this post heavily as a reference; [URL] .... however it is highly incomplete and this is above my knowledge so I'm struggling somewhat.

I was able to get the bulk of it working with some guess work and modification to the code from that link.

For some reason i had to comment out "mstream(void);" and "~mstream(void);"

Also how to get :

mstream& operator<< (ostream& (*pfun)(ostream&)) {
pfun(coss);
pfun(cout);
return *this;
}

to work for endl as per the previous link. Not sure if i'm even putting it in the right place. Otherwise the code works fine for streaming to both locations and such. See the code below;

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
class mstream {

[Code] ....