'Creating file with ofstream does not work in Qt, why?

Why below code is not working on Qt (MinGW compiler):

auto cDir = QDir::currentPath();

ifstream dFile("3.txt", std::fstream::in);
ofstream f1;
ofstream f2("0.txt", std::fstream::out);
f1.open("1.txt", std::ios::out | std::ios::trunc);

if (f1.is_open())
    return 0;

if (f2.is_open())
    return 1;

dFile is fine, opened and can be read. f1 and f2 are not opened (if exist) nor created.

c++qtfile


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