PhantomInvariantLifetime in core::marker - Rust (original) (raw)

Struct PhantomInvariantLifetime

Source

pub struct PhantomInvariantLifetime<'a>(/* private fields */);

🔬This is a nightly-only experimental API. (phantom_variance_markers #135806)

Expand description

Zero-sized type used to mark a lifetime as invariant.

Invariant lifetimes must be live for the exact length declared, neither shorter nor longer. See the reference for more information.

§Layout

For all 'a, the following are guaranteed:

• size_of::<PhantomInvariantLifetime<'a>>() == 0
• align_of::<PhantomInvariantLifetime<'a>>() == 1

Source§

Source

🔬This is a nightly-only experimental API. (phantom_variance_markers #135806)

Constructs a new instance of the variance marker.

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