How to use is_regular_file or what to use instead?

Question

I get the path of "ofstream fout" using getline(), and need to check if it correct to open and output values.
I was told that this function can help to avoid files like "con.txt".
Tried it many times but always got library errors because of fstream and becuse filesystem is not a part of namspace std.

Answer 1

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https://www.sololearn.com/post/75089/?ref=app

Looks like <filesystem> needs C++17.