On Friday, 11 September 2015 at 03:25:58 UTC, SimonN wrote:
Hi,
this looks excellent! I've been playing around with it, and am
looking forward to using it regularly.
I've ran into a compilation error when iterating over a const
Enumap. In the following code:
import std.stdio;
import std.conv;
import enumap;
enum MyEnum { e1, e2, e3 }
struct A
{
Enumap!(MyEnum, int) map;
void mutable_output()
{
foreach (MyEnum e, int i; map)
writefln("%s: %d", e.to!string, i);
}
void const_output() const
{
foreach (MyEnum e, const int i; map)
writefln("%s: %d", e.to!string, i);
}
}
...the first method (mutable_output) compiles and works with no
errors. The const method, however, gives:
source/app.d(19,13): Error: invalid foreach aggregate
this.map,
define opApply(), range primitives, or use .tupleof".
It doesn't seem to matter whether I put const int, or int, in
the foreach statement.
What's the idiomatic way to loop over a const Enumap? :-)
-- Simon
Interesting, thanks for pointing that out.
I don't think I did a great job with const-correctness here, I'll
take a look tomorrow.
It should definitely be possible to iterate over (and index,
etc...) a const/immutable Enumset, though you're right that it
doesn't work right now.
