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
[−][src]

    pub extern "rust-intrinsic" fn variant_count<T>() -> usize

🔬 This is a nightly-only experimental API. (`core_intrinsics`)

intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

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`.