Enum PidFlagPolicy 

pub enum PidFlagPolicy {
    SentinelMustUnderstand,
    Bare,
    ImplExtensionOnMembers,
}

What flags a PL_CDR1 parameter id carries, at a position.

The byte-layer half of zerodds_ast_layout::PidFlagPolicy, which carries the measurement. XTypes 1.3 §7.4.1.2 splits the sixteen-bit field: the low fourteen bits are the id, bit 14 is PID_MUST_UNDERSTAND and bit 15 is PID_IMPL_EXTENSION.

A member’s own must_understand is not on this axis — it is PlCdr1Framing::member_must_understand, and the writer ORs the two together. This one answers the part that does not depend on what the member declared, which is the whole of the sentinel’s answer: PID_LIST_END is not a member and has nothing to declare.

Variants

SentinelMustUnderstand

A bare member id, and PID_MUST_UNDERSTAND on the sentinel. Cyclone DDS and RTI Connext 7.7.

Bare

Bare everywhere. Fast DDS.

ImplExtensionOnMembers

PID_IMPL_EXTENSION | PID_MUST_UNDERSTAND on every member id whatever the member declared, and a bare sentinel. OpenDDS.

Measured on the short header only: OpenDDS writes no extended header anywhere in the recorded corpus, so Writer::write_pid_extended does not claim an answer for FLAG_1 of an eMemberHeader.

Implementations

impl PidFlagPolicy

pub const fn flags_at(self, position: WirePosition) -> u16

The flag bits a parameter id carries at position.

Only WirePosition::Member, WirePosition::Sentinel and WirePosition::ExtendedMarker have a parameter id at all; WirePosition::Element answers zero because there is nothing there to carry a flag.

The marker’s answers are Cyclone and RTI 7f01, Fast DDS 3f01, OpenDDS ff01 — the same three values, at a third position.

Trait Implementations

impl Clone for PidFlagPolicy

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PidFlagPolicy

impl Debug for PidFlagPolicy

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

Formats the value using the given formatter.

impl Default for PidFlagPolicy

fn default() -> Self

Returns the “default value” for a type.

impl Eq for PidFlagPolicy

impl PartialEq for PidFlagPolicy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PidFlagPolicy