How to use fstream objects with relative path?

Question

Do I always have to specify absolute path for objects instantiated from std::fstream class? In other words, is there a way to specify just relative path to them

Answer 1

Say you have a src folder directly under your project directory and the src folder contains another tmp_folder folder which contains a txt file named readMe.txt. So the txt file can be read in this way

std::ifstream fin("../src/tmp_folder/readMe.txt");