offset_of in core::intrinsics - Rust
Description: The offset of a field inside a type.

## offset_of

# Function offset_of

Source

    pub const fn offset_of<T: PointeeSized>(variant: u32, field: u32) -> usize

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

The offset of a field inside a type.

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.

This intrinsic can only be evaluated at compile-time, and should only appear in constants or inline const blocks.

The stabilized version of this intrinsic is `core::mem::offset_of`. This intrinsic is also a lang item so `offset_of!` can desugar to calls to it.