Struct SegmentDescriptor 

#[repr(C)]
pub struct SegmentDescriptor {
    pub offset: [u8; 4],
    pub count: [u8; 2],
    pub element_size: [u8; 2],
}

On-wire segment descriptor.

Each 8-byte entry describes one variable-length array within a segmented account. The descriptor lives in the segment table region, between the fixed prefix and the segment data.

Fields

offset: [u8; 4]

Byte offset from the start of the account data to the first element of this segment.

count: [u8; 2]

Number of elements currently stored in this segment.

element_size: [u8; 2]

Size of each element in bytes.

Implementations

impl SegmentDescriptor

pub const fn new(offset: u32, count: u16, element_size: u16) -> Self

Create a new descriptor.

pub const fn offset(&self) -> u32

Read the byte offset.

pub const fn count(&self) -> u16

Read the element count.

pub const fn element_size(&self) -> u16

Read the element size.

pub const fn data_len(&self) -> usize

Total byte footprint of this segment’s data (count × element_size).

pub const fn byte_range(&self) -> Option<(usize, usize)>

Byte range [offset .. offset + data_len). Returns None on overflow.

Trait Implementations

impl Clone for SegmentDescriptor

fn clone(&self) -> SegmentDescriptor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SegmentDescriptor

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

Formats the value using the given formatter.

impl FixedLayout for SegmentDescriptor

const SIZE: usize = SEGMENT_DESC_SIZE

The exact byte size of this type on-chain.

impl PartialEq for SegmentDescriptor

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for SegmentDescriptor

impl Eq for SegmentDescriptor

impl Pod for SegmentDescriptor

impl StructuralPartialEq for SegmentDescriptor