On Sunday, 29 May 2016 at 09:07:07 UTC, Jonathan M Davis wrote:
On Sunday, May 29, 2016 07:14:12 ParticlePeter via
Digitalmars-d-learn wrote:
[...]
std.container.array.Array works with foreach via ranges.
foreach(e; myContainer)
{
}
gets lowered to
foreach(e; myContainer[])
{
}
which in turn gets lowered to something like
for(auto r = myContainer[]; !r.empty; r.popFront())
{
auto e = r.front;
}
Ranges do not support indices with foreach, and that's why
you're not able to get the index with foreach and Array.
However, if you use std.range.lockstep, you can wrap a range to
get indices with foreach. e.g.
foreach(i, e; lockstep(myContainer[]))
{
}
http://dlang.org/phobos/std_range.html#.lockstep
- Jonathan M Davis
I'd say that std.range.enumerate is more indicative of intent:
http://dlang.org/phobos/std_range.html#enumerate