On Friday, 30 January 2015 at 12:55:20 UTC, Adam D. Ruppe wrote:
On Friday, 30 January 2015 at 11:55:16 UTC, Laeeth Isharc wrote:
As I understand it, foreach allocates when a simple C-style
for using an array index would not.
foreach is just syntax sugar over a for loop. If there's any
allocations, it is because your code had some, it isn't inherit
to the loop. The doc definition even lists the translation of
foreach to for in the case of ranges explicitly:
http://dlang.org/statement.html#ForeachStatement
The most likely allocation would be to a user-defined opApply
delegate, and you can prevent that by making it opApply(scope
your_delegate) - the scope word prevents any closure allocation.
Thanks, Adam. That's what I had thought (your first paragraph),
but something Ola on a different thread confused me and made me
think I didn't understand it, and I wanted to pin it down.
The second paragraph is very helpful - appreciate it.
Laeeth.
