How to get file extension from string in C++

Question

Given a string "filename.conf", how to I verify the extension part?

I need a cross platform solution.

Answer 1

Is this too simple of a solution?

#include <iostream> #include <string>  int main() {   std::string fn = "filename.conf";   if(fn.substr(fn.find_last_of(".") + 1) == "conf") {     std::cout << "Yes..." << std::endl;   } else {     std::cout << "No..." << std::endl;   } }