OnceNonZeroUsize

swc_core::ecma::atoms::once_cell::race

Struct OnceNonZeroUsize 

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pub struct OnceNonZeroUsize { /* private fields */ }
Available on crate features __ecma and ecma_ast only.
Expand description

A thread-safe cell which can be written to only once.

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impl OnceNonZeroUsize

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pub const fn new() -> OnceNonZeroUsize

Creates a new empty cell.

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pub fn get(&self) -> Option<NonZero<usize>>

Gets the underlying value.

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pub unsafe fn get_unchecked(&self) -> NonZero<usize>

Get the reference to the underlying value, without checking if the cell is initialized.

§Safety

Caller must ensure that the cell is in initialized state, and that the contents are acquired by (synchronized to) this thread.

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pub fn set(&self, value: NonZero<usize>) -> Result<(), ()>

Sets the contents of this cell to value.

Returns Ok(()) if the cell was empty and Err(()) if it was full.

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pub fn get_or_init<F>(&self, f: F) -> NonZero<usize>
where F: FnOnce() -> NonZero<usize>,

Gets the contents of the cell, initializing it with f if the cell was empty.

If several threads concurrently run get_or_init, more than one f can be called. However, all threads will return the same value, produced by some f.

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pub fn get_or_try_init<F, E>(&self, f: F) -> Result<NonZero<usize>, E>
where F: FnOnce() -> Result<NonZero<usize>, E>,

Gets the contents of the cell, initializing it with f if the cell was empty. If the cell was empty and f failed, an error is returned.

If several threads concurrently run get_or_init, more than one f can be called. However, all threads will return the same value, produced by some f.

Trait Implementations§

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impl Debug for OnceNonZeroUsize

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Default for OnceNonZeroUsize

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fn default() -> OnceNonZeroUsize

Returns the “default value” for a type. Read more

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes