Function core::intrinsics::variant_count
const: unstable · source · pub extern "rust-intrinsic" 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 is safe to call;
it does not require an unsafe
block.
Therefore, implementations must not require the user to uphold
any safety invariants.
The to-be-stabilized version of this intrinsic is mem::variant_count
.