cet-is » art

The following example code was provided that produces the behavior:

//......................................................................

void DemoModule::beginJob()
{
   art::ServiceHandle<art::TFileService> tfs;

  fHisto = tfs->make<TH1F>("fHisto",
                           "title;xlabel;ylabel",
                           100,0.,100.);

  tfs->file().mkdir("foo");
  tfs->file().cd("foo");

  tfs->make<TH1F>("fHistofoo",
                  "title;xlabel;ylabel",                      
         100,0.,100.);

   tfs->file().mkdir("bar");
}

I would expect to get a fHisto and the foo directory inside of the
overall "demo" directory, with fHistofoo and the bar directory nested
inside that.
Instead, I seem to have "demo", "foo" and "bar" directories at toplevel,
and both histograms inside "demo".
I suspect I've misunderstood something here...
(There also seems to be a mkdir, but no cd, on tfs itself, without using
file(), but that didn't seem to do anything at all).

We would request that this be examined for consistency with the expected behavior.

To be verified with Mu2e.

The following fragment works for Mu2e:

    art::ServiceHandle<art::TFileService> tfs;
    art::TFileDirectory tfdir = tfs->mkdir( "ConversionGun" );

    _hMultiplicity = tfdir.make<TH1F>( "hMultiplicity", "Conversion Multiplicity",  10,  0.,  10.  );
    _hcz           = tfdir.make<TH1F>( "hcz",
                                       "Conversion Electron cos(theta) at Production;(MeV)",
                                       100,  -1.,  1.  );

This was taken from:

http://cdcvs0.fnal.gov/cgi-bin/public-cvs/cvsweb-public.cgi/mu2e/Offline/EventGenerator/src/ConversionGun.cc?rev=1.33&content-type=text/x-cvsweb-markup

I just checked. That mu2e code sample also works in my package. Thanks!