Struct NestedShare 

pub struct NestedShare {
    pub heap_id_at: usize,
    pub target: SharedKey,
}

One place a message body holds another shared message’s heap ID.

The attribute message is the one class that does this: H5A__create shares the attribute’s datatype and dataspace before H5O__attr_create shares the attribute (H5Aint.c:375-377), so the body that reaches the heap carries their heap IDs and says so in its own flags byte. Those IDs are zero in SharedMessage::body — the heap has not been laid out when the body is offered — and build_shared_messages fills them in.

The target is named by its own key rather than by position: an index picks messages by class, so an attribute’s datatype can belong to a different index than the attribute, and a reader resolves the pointer through the master table by class as well (H5SM_get_fheap_addr).

Fields

heap_id_at: usize

Offset in the body of the eight-byte heap ID, i.e. two bytes past the start of the H5O_shared_t that holds it.

target: SharedKey

The message this pointer names. It holds no nesting of its own — datatype and dataspace messages have nothing to nest.

Trait Implementations

impl Clone for NestedShare

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NestedShare

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

Formats the value using the given formatter.

impl Eq for NestedShare

impl Hash for NestedShare

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for NestedShare

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for NestedShare