On Thursday, 13 February 2014 at 02:14:02 UTC, Jakob Ovrum wrote:
On Thursday, 13 February 2014 at 02:02:38 UTC, Anton wrote:
I'm confused about how to use random.uniform to select a
member of an enum.
Say I have an enum like
enum Animals
{
cat = 0,
dog = 1,
chimpanzee = 2
}
I want to select a random animal. So far I've been trying to
do uniform(Animals), but every time I try to compile that, I
get a "does not match any function template declaration" error.
Am I misunderstanding how this function is meant to be used?
The problem with using `uniform` for enums is that not all
enums are sequential without holes, which would make the
`uniform` implementation quite non-trivial if it were to try to
handle enums generically.
If you know your enum is sequential and doesn't have any holes,
assume responsibility for that fact with a cast:
---
enum Animals
{
cat = 0,
dog = 1,
chimpanzee = 2
}
void main()
{
import std.random, std.stdio;
foreach(immutable _; 0 .. 10)
writeln(cast(Animals)uniform!"[]"(Animals.min, Animals.max));
}
---
Could you not simply select one at random by "name"? Even though
the values of the enum may not be sequential the keys are.
