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Based on cppreference, I was under impression that std::canonical and std::weakly_canonical return the input path if it is an absolute directory path to existing directory that has no dot, dot-dot elements or symbolic links. But in certain cases I see that the call results in an error.

This program:

#include <filesystem>
#include <iostream>

int main() {
    std::error_code ec;
    auto dir = std::filesystem::temp_directory_path( ec );
    std::cout << dir.string() << "\n";
    std::cout << exists( dir, ec ) << is_directory( dir, ec ) << "\n";
    std::cout << weakly_canonical( dir, ec ) << "\n";
    std::cout << ec.message() << "\n";
}

being executed on godbolt prints

C:\Windows\SystemTemp\
11
""
Access is denied.

Is the implementation correct here?

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  • Could you check the status of the earlier components of the path, namely "C:\\" and "C:\\Windows\\"? The check for existence probably begins at the start and builds up what exists, not at the end and removes what does not exist. Commented Sep 27 at 23:00
  • 1
    @JaMiT, thanks for the idea. It appears that "C:\\" is not even an existing directory, while "C:\\Windows\\" already exists. And std::canonical fails for all of them: gcc.godbolt.org/z/qPev761er Commented Sep 28 at 9:13
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