Module core::mem

Basic functions for dealing with memory.

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

Modules

• manually_drop 🔒
• maybe_uninit 🔒
• transmutability 🔒

Macros

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

Structs

• AssumeExperimental
  What transmutation safety conditions shall the compiler assume that you are checking?
• Discriminant
  Opaque type representing the discriminant of an enum.
• ManuallyDrop
  A wrapper to inhibit compiler from automatically calling T’s destructor. This wrapper is 0-cost.

Traits

• BikeshedIntrinsicFromExperimental
  Are values of a type transmutable into values of another type?
• SizedTypePropertiesExperimental
  Provides associated constants for various useful properties of types, to give them a canonical form in our code and make them easier to read.

Functions

• 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.
• discriminant
  Returns a value uniquely identifying the enum variant in v.
• drop
  Disposes of a value.
• replace
  Moves src into the referenced dest, returning the previous dest value.
• swap
  Swaps the values at two mutable locations, without deinitializing either one.
• swap_simple 🔒
  Same as swap semantically, but always uses the simple implementation.
• variant_countExperimental
  Returns the number of variants in the enum type T.
• 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.
• 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.
• size_of
  Returns the size of a type in bytes.
• size_of_val
  Returns the size of the pointed-to value in bytes.
• 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.

Unions

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