Why does my c++ code using ofstream fail to crete the file on /tmp subdirectory?

The following code fails to create the file on /tmp. This happens even if I execute the binary as sudo

#include <iostream>
#include <fstream>

using namespace std;

int main()
{
        ofstream of("/tmp/DIR1/DIR2/test_file",std::ios::out | std::ios::trunc);
        of.close();
        return 0;
}

If I remove DIR1/DIR2/ from the file path, a test_file does get created on /tmp. I am using linux mint.

Whats happening here?