Struct Presence 

pub struct Presence {
    pub optional: bool,
    pub nullable: bool,
}

Two independent axes, not one. An absent key means “don’t touch this field”; an explicit null means “clear it”.

.seam	optional	nullable
String	false	false
String?	false	true
optional String	true	false
optional String?	true	true

Fields

optional: bool

nullable: bool

Implementations

impl Presence

pub const fn required() -> Self

pub const fn nullable() -> Self

pub const fn optional() -> Self

pub const fn optional_nullable() -> Self

Trait Implementations

impl Clone for Presence

fn clone(&self) -> Presence

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Presence

impl Debug for Presence

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

Formats the value using the given formatter.

impl Default for Presence

fn default() -> Presence

Returns the “default value” for a type.

impl Eq for Presence

impl PartialEq for Presence

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Presence