Struct UserDatatype 

pub struct UserDatatype { /* private fields */ }

A user-defined (derived) datatype describing a non-contiguous layout as a type map: a set of (byte_offset, byte_length) blocks repeated with a fixed byte extent. Mirrors rsmpi’s UserDatatype.

This implementation supports the common constructors — contiguous, vector, indexed and structured — over a primitive base type. Send a derived layout with View; receive one with MutView.

Implementations

impl UserDatatype

pub fn contiguous(count: Count, base: DatatypeRef) -> UserDatatype

count contiguous copies of base (MPI_Type_contiguous).

pub fn vector( count: Count, blocklength: Count, stride: Count, base: DatatypeRef, ) -> UserDatatype

count blocks of blocklength base elements, each stride base elements apart (MPI_Type_vector).

pub fn indexed( blocklengths: &[Count], displacements: &[Count], base: DatatypeRef, ) -> UserDatatype

Blocks of the given per-block lengths at the given base-element displacements (MPI_Type_indexed).

pub fn structured( blocklengths: &[Count], byte_displacements: &[isize], base: DatatypeRef, ) -> UserDatatype

Blocks of the given per-block base-element lengths at explicit byte displacements (MPI_Type_create_struct, single base type).

pub fn id(&self) -> u32

The datatype’s stable id.

pub fn extent(&self) -> usize

The byte extent (stride) of one element (MPI_Type_extent).

pub fn base_count(&self) -> Count

The number of base elements in one element of this datatype.

pub fn pack(&self, base: &[u8], count: Count) -> Vec<u8>

Gather count elements of this datatype from base into a contiguous packed byte buffer.

pub fn unpack(&self, packed: &[u8], base: &mut [u8], count: Count)

Scatter count packed elements back into base according to the type map.

Trait Implementations

impl Clone for UserDatatype

fn clone(&self) -> UserDatatype

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UserDatatype

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

Formats the value using the given formatter.