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.