Module mem

Available on crate feature std only.

Basic functions for dealing with memory.

This module contains functions for querying the size and alignment of types, initializing and manipulating memory.

Macros

• offset_of
  Expands to the offset in bytes of a field from the beginning of the given type.

Structs

• Discriminant
  Opaque type representing the discriminant of an enum.
• ManuallyDrop
  A wrapper to inhibit the compiler from automatically calling T’s destructor. This wrapper is 0-cost.
• AssumeExperimental
  Configurable proof assumptions of TransmuteFrom.

Traits

• TransmuteFromExperimental
  Marks that Src is transmutable into Self.

Functions

• align_of
  Returns the ABI-required minimum alignment of a type in bytes.
• align_of_val
  Returns the ABI-required minimum alignment of the type of the value that val points to in bytes.
• discriminant
  Returns a value uniquely identifying the enum variant in v.
• drop
  Disposes of a value.
• forget
  Takes ownership and “forgets” about the value without running its destructor.
• min_align_ofDeprecated
  Returns the ABI-required minimum alignment of a type in bytes.
• min_align_of_valDeprecated
  Returns the ABI-required minimum alignment of the type of the value that val points to in bytes.
• needs_drop
  Returns true if dropping values of type T matters.
• replace
  Moves src into the referenced dest, returning the previous dest value.
• size_of
  Returns the size of a type in bytes.
• size_of_val
  Returns the size of the pointed-to value in bytes.
• swap
  Swaps the values at two mutable locations, without deinitializing either one.
• take
  Replaces dest with the default value of T, returning the previous dest value.
• transmute^⚠
  Reinterprets the bits of a value of one type as another type.
• transmute_copy^⚠
  Interprets src as having type &Dst, and then reads src without moving the contained value.
• uninitialized^⚠Deprecated
  Bypasses Rust’s normal memory-initialization checks by pretending to produce a value of type T, while doing nothing at all.
• zeroed^⚠
  Returns the value of type T represented by the all-zero byte-pattern.
• align_of_val_raw^⚠Experimental
  Returns the ABI-required minimum alignment of the type of the value that val points to in bytes.
• copyExperimental
  Bitwise-copies a value.
• forget_unsizedExperimental
  Like forget, but also accepts unsized values.
• size_of_val_raw^⚠Experimental
  Returns the size of the pointed-to value in bytes.
• variant_countExperimental
  Returns the number of variants in the enum type T.

Unions

• MaybeUninit
  A wrapper type to construct uninitialized instances of T.