title: std::ofstream and system touch
body: <p>Profiling one of my C++ programs I just discovered that calling std::ofstream(), when creating a bunch of files, takes much less time than using the system "touch".</p>
  
  <p>So now I was wondering what OS function the std::ofstream is mapped to, on Linux.</p>
  
  <p>Do you know what std::ofstream() calls to create a file?</p>
  
  <p>Thanks</p>