Enum ParameterRole 

pub enum ParameterRole {
    Member,
    Optional,
}

Which of §7.4.1.2’s two roles a parameter header stands in.

The header is the same header — the id, the length, the short and extended forms are all one clause. The role decides what the length field counts, and whether a member that took no value writes a header at all.

Variants

Member

A member of a @mutable type. Rules (24) and (25). Absence is written by leaving the parameter out.

Optional

An @optional member of a type that is not @mutable. Rule (19). Absence is written as a header with a length of zero.

Trait Implementations

impl Clone for ParameterRole

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 ParameterRole

impl Debug for ParameterRole

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

Formats the value using the given formatter.

impl Default for ParameterRole

fn default() -> Self

Returns the “default value” for a type.

impl Eq for ParameterRole

impl PartialEq for ParameterRole

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ParameterRole