How can I tell if the give parameter can be run at compile time?
Adam D. Ruppe
destructionator at gmail.com
Mon Mar 1 20:14:09 UTC 2021
On Monday, 1 March 2021 at 20:05:57 UTC, Jack wrote:
> int a;
> enum s = "";
> // both return false but g(s) is expected to return true
So the value must be known at compile time without any extra
context. So that `a` variable might be changed somewhere else so
compile time can't read or write it.
`enum` is only allowed to be set once (and at compile time!) so
it is allowed at CT too.
`static immutable` generally allows it too since it must be set
at declaration then never changed again.
But almost any mutable variable is no go unless it is directly
returned from a function which itself can be called at compile
time.
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