Function std::intrinsics::variant_count
pub extern "rust-intrinsic" fn variant_count<T>() -> usize
core_intrinsics)intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library
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.
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/intrinsics/fn.variant_count.html