How can I call an arbitrary constructor dynamically?

ROOT
1

Hi,
I’ve got a TClass object pointing to a ROOT object. Say TH1F. I’d like to call the ctor with teh arguments “dude”, “here”, 100, 0.0, 100.0 - how do I do that? I know I can do TClass::New to create an object with the default construtor - but I’d like to do it for a non-default one. TMethodCall looks promising, but I’m a bit nervous about how I should pre-allocate memory, etc., etc…

Cheers,
Gordon.

2

In the end, things like pyROOT and the ruby linkage must do this on their own. So, copy them. Unfortunately, this means going down into code against CINT directly - which requires some effort. It took me about 6-8 hours of work to get everything (not just ctor’s, but other methods as well).