Uphill

[via Digitalmars-d]

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.