On Tuesday, 2 June 2015 at 06:32:43 UTC, Jonathan M Davis wrote:
D's semantics for __FILE__ and __LINE__ are so much better than C++'s. I sorely miss D's semantics for them whenever I'm in C++. Having them get the values from the call site rather than the declaration site is so much more useful that it's not even funny.
But you are referring to evaluation of default parameters. Evaluating default parameters at the call site can be problematic, so I don't think this is obvious at all.
All functions have a conceptual object which is the "activation record", often represented by the stack frame (but in some languages a heap object). It would be reasonable to be able to query this "activation record" object, just like you have "this" that refers to the object of a method you could have a "thisfunction.caller.lineno" etc.
