Question

OK so I’ve almost completed a program. However whilst it works on Windows I would prefer to run it on my Mac to test differences in performance (my Mac has much faster hardware).

I have an unordered map that is storing in values from a text file and I am also copying this map to reverse the key/value pairs.

The text files keep adding a new line, and from research I’ve found it to be because Windows adds it’s own carriage return (why?!) and it’s at the end of every second element in my map.
The file is “stringx,stringy” and so am using stringstream to split the string x and y into the key/value pair.

EDIT: thanks for the answers guys, worked a treat!

Answer 1

That isn’t how std::string::replace works, you should read up on how it works here.

In order to do a basic replace, you could write your own function to do it, however in your case it seems to be a trimming issue since the carriage return is usually on the right side of the string.

You can remove the carriage return and new line by doing something like this:

std::string& rtrim(std::string& str) {
    size_t endpos = str.find_last_not_of("\r\n");
    if(endpos != std::string::npos) {
        str.substr(0,endpos+1).swap(str);
    }
    return str;
}