13 Jan
2005
13 Jan
'05
3:15 a.m.
Joel writes:
I forgot to mention that the "outer" solution has another drawback: it is more expensive.
At run-time, that is :).
We have to make a full copy of the entire arguments tuple of each scope outwards. With the local vars solution, you only use what you need.
I know, I know :), yes you can also make "outer" only get what it needs by inspecting the scopes. But that involves a lot of compile time processing for little gain. Implementation wise, the local variables solution gives more bang for the buck.
The balance seems to be different at compile-time. 'scope' + 'outer' are almost trivial to implement and also the winners syntax-wise (IMO). -- Aleksey Gurtovoy MetaCommunications Engineering