Context

I came across some code, like this:

if( Some_Condition ) throw 0;

I googled a bit, and found a few other code snippets using that odd looking throw 0 form.

I presume one would catch this as:

catch(const int& e) 
{  }

Or is this a NULL ptr? to be caught as void* ?

Question

What does this throw 0 do? Is it special in some way?

My normal preference would be to throw something that is (or derived from) std::exception. So to me this looks "bad". Is it "bad" ?