On 09/01/2011 12:26 AM, Simen Kjaeraas wrote:
On Wed, 31 Aug 2011 23:54:04 +0200, Timon Gehr <timon.g...@gmx.ch> wrote:
[2 * x ; x <- iota(10), log(x), x*x > 4]
or, in a library:
compr!q {2 * x ; x <- iota(10), log(x), x*x > 4};
compr!q{2 * x ; x <- iota(10), log(x), x*x > 4};
The library solution has problems with scope variables.
I know, that is why I have not implemented this yet. Basically it should
be possible to implicitly pass a whole scope to a template, or at least,
to have local templates.
Example:
auto foo(Range)(int n, Range r) {
return compr!q{x * n; x <- arr, log(x), x*x > 4};
}
Workaround:
auto foo(Range)(int n, Range r) {
mixin Compr!q{x * n ; x <- arr, log(x), x*x > 4};
return compr;
}
More importantly, IMO, is that the notation does not clearly
mark what is what. is that interpreted (iota(10), log(x))
or (log(x), x*x > 4)?
It actually does. The comma is a mere separator, and imho it looks very
clean. It is just like the set builder syntax you like. (it even has the
curly brackets!)
