David Abrahams wrote:
Aleksey Gurtovoy wrote:
Any particular reason why you decided against implicit scoping along the lines of
for_each( _1, push_back(_1, outer(_2)) )
?
It doesn't generalize all that well, FWIW.
Of course it does.
What if you have to go out by 2 scopes?
outer( outer(_2) )
or outer<2>(_2)
All this is discussed in the conversation I posted earlier -- in which you participated ;).
Yeah, it was just hard to read for the aforementioned reason.
I forgot to mention that the "outer" solution has another drawback: it is more expensive. 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. I'm still unsure if we need two ways to do things. That might be a reason why I hesitated to doc the "outer" stuff. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net