variant_count in std::intrinsics - Rust
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.
Keywords: rust, rustlang, rust-lang, variant_count

# Function std::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`.