Module zerovec::ule

Traits over unaligned little-endian data (ULE, pronounced “yule”).

The main traits for this module are ULE, AsULE and, VarULE.

See the design doc for details on how these traits works under the hood.

Re-exports

• pub use super::ZeroVecError;

Modules

• custom
  Documentation on implementing custom VarULE types.
• tuple
  ULE impls for tuples.

Structs

• CharULE
  A u8 array of little-endian data corresponding to a Unicode scalar value.
• MultiFieldsULE
  This type is used by the custom derive to represent multiple VarULE fields packed into a single end-of-struct field. It is not recommended to use this type directly.
• NichedOption
  Optional type which uses NichedOptionULE<U,N> as ULE type. The implementors guarantee that N == core::mem::sizeo_of::<Self>() [repr(transparent)] guarantees that the layout is same as Option<U>
• OptionULE
  This type is the ULE type for Option<U> where U is a ULE type
• OptionVarULE
  A type allowing one to represent Option<U> for VarULE U types.
• RawBytesULE
  A u8 array of little-endian data with infallible conversions to and from &u8.
• UnvalidatedChar
  A u8 array of little-endian data that is expected to be a Unicode scalar value, but is not validated as such.
• UnvalidatedStr
  A byte slice that is expected to be a UTF-8 string but does not enforce that invariant.

Traits

• AsULE
  A trait for any type that has a 1:1 mapping with an unaligned little-endian (ULE) type.
• EncodeAsVarULE
  Allows types to be encoded as VarULEs. This is highly useful for implementing VarULE on custom DSTs where the type cannot be obtained as a reference to some other type.
• EqULE
  An EqULE type is one whose byte sequence equals the byte sequence of its ULE type on little-endian platforms. This enables certain performance optimizations, such as ZeroVec::try_from_slice.
• NicheBytes
  The ULE types implementing this trait guarantee that NicheBytes::NICHE_BIT_PATTERN can never occur as a valid byte representation of the type.
• SliceAsULE
  A trait for a type where aligned slices can be cast to unaligned slices.
• ULE
  Fixed-width, byte-aligned data that can be cast to and from a little-endian byte slice.
• VarULE
  Variable-width, byte-aligned data that can be cast to and from a little-endian byte slice.

Functions

• encode_varule_to_box
  Given an EncodeAsVarULE type S, encode it into a Box<T>

Unions

• NichedOptionULE
  ULE type for NichedOption<U,N> where U implements NicheBytes. The invalid bit pattern is used as the niche.

Derive Macros

• ULE
  Custom derive for ULE.
• VarULE
  Custom derive for VarULE