Let’s do overloaded functions first...

call hfill(10,x,0,1.)

call hfill(20,x,y,1.)

call hfill(10,x,0,1)

Remember this?

It’s a bit annoying:

• you always need 4 parameters

• the parameters have to be of the right type

Wouldn’t it be nice if

• hfill(10,x) meant “hfill(10,x,0,1.)”

• hfill(10,x,y) meant “hfill(10,x,0,y)” for one-dim histograms

• hfill(10,x,y) meant “hfill(10,x,y,1.)” for two-dim histograms

but since there is only one “hfill” function, you cannot do that in Fortran or C.

TH1F *h1 = new TH1F(”Name",”Title",128,0.,400.);

TH2F *h2 = new TH2F(”Name",”Title",16,0.,40.,16,0.,40.);

h1->Fill(x);

h1->Fill(x,weight);

h2->Fill(x,y);

h2->Fill(x,y,weight);

In C++, you can! These are ROOT TH1F and TH2F histogram, with overloaded fill methods

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