pub const fn variant_count<T>() -> usize
🔬This is a nightly-only experimental API. (
core_intrinsics
)Expand description
Returns the number of variants of the type T
cast to a usize
;
if T
has no variants, returns 0
. Uninhabited variants will be counted.
Note that, unlike most intrinsics, this can only be called at compile-time
as backends do not have an implementation for it. The only caller (its
stable counterpart) wraps this intrinsic call in a const
block so that
backends only see an evaluated constant.
The to-be-stabilized version of this intrinsic is crate::mem::variant_count
.