Struct rustc_hash::FxHasher [] [src]

pub struct FxHasher { /* fields omitted */ }

A speedy hash algorithm for use within rustc. The hashmap in liballoc by default uses SipHash which isn't quite as speedy as we want. In the compiler we're not really worried about DOS attempts, so we use a fast non-cryptographic hash.

This is the same as the algorithm used by Firefox -- which is a homespun one not based on any widely-known algorithm -- though modified to produce 64-bit hash values instead of 32-bit hash values. It consistently out-performs an FNV-based hash within rustc itself -- the collision rate is similar or slightly worse than FNV, but the speed of the hash function itself is much higher because it works on up to 8 bytes at a time.

Trait Implementations

impl Default for FxHasher
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Returns the "default value" for a type. Read more

impl Hasher for FxHasher
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Writes some data into this Hasher. Read more

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Writes a single u8 into this hasher.

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Writes a single u16 into this hasher.

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Writes a single u32 into this hasher.

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Writes a single u64 into this hasher.

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Writes a single usize into this hasher.

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Returns the hash value for the values written so far. Read more

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🔬 This is a nightly-only experimental API. (i128)

Writes a single u128 into this hasher.

1.3.0
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Writes a single i8 into this hasher.

1.3.0
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Writes a single i16 into this hasher.

1.3.0
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Writes a single i32 into this hasher.

1.3.0
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Writes a single i64 into this hasher.

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🔬 This is a nightly-only experimental API. (i128)

Writes a single i128 into this hasher.

1.3.0
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Writes a single isize into this hasher.

Auto Trait Implementations

impl Send for FxHasher

impl Sync for FxHasher