Using in one class a constant defined in another class
Adam D Ruppe
destructionator at gmail.com
Tue Nov 16 18:24:29 UTC 2021
On Tuesday, 16 November 2021 at 18:12:34 UTC, chopchop wrote:
> class Ground
> immutable WALL = -2;
immutable isn't automatically static, so you'd want to use
`static immutable` to share the value across all instances.
(you can actually initialize immutable things to different values
in a constructor, then it is locked for the lifetime of the
instance. Being static of course means no more per-instance
> x = Ground.playgroundWidth/2;
Yes, D always uses `.` including places where C uses `->` and C++
uses `::`. Almost always plain dot in D.
> anything in the documentation. Why enum works and immutable
> does not?
enum only exists at compile time, so it also implies static. The
difference between static immutable and enum is that enum acts
like a literal - it is an rvalue and has no address. Only the
compiler knows about it. static immutable actually does have a
memory address so you can take a pointer to it.
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