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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 such as project path?
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You can use relative paths. They're treated the same as relative paths for any other file operations, like fopen ; there's nothing special about fstream in that regard.
A relative path refers to a location that is relative to a current directory. Relative paths make use of two special symbols, a dot (.) and a double-dot (..), which translate into the current directory and the parent directory. Double dots are used for moving up in the hierarchy.
You can use relative paths as well. But they are relative to the environment you call your executable from.
This is OS dependent but all the major systems behave more or less the same AFAIK.
Windows example:
// File structure: c:\folder\myprogram.exe c:\myfile.txt // Calling command from folder c:\folder > myprogram.exe In the above example you could access myfile.txt with "c:/myfile.txt" or "../myfile.txt". If myprogram.exe was called from the root c:\ only the absolute path would work, but instead "myfile.txt" would work.
As Rob Kennedy said in the comments there's really nothing special about paths regarding fstream. But here is a code example using a relative path:
#include <fstream> int main() { std::ifstream ifs("../myfile.txt"); ... // Do something sensible with the file } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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