Enum ConstraintKind 

pub enum ConstraintKind {
    Key,
    Unique,
    KeyRef,
}

Variants

Key

xs:key — unique, all fields required.

Unique

xs:unique — unique, missing fields allowed.

KeyRef

xs:keyref — each tuple must match a key/unique tuple in scope.

Trait Implementations

impl Clone for ConstraintKind

fn clone(&self) -> ConstraintKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ConstraintKind

impl Debug for ConstraintKind

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

Formats the value using the given formatter.

impl Eq for ConstraintKind

impl PartialEq for ConstraintKind

fn eq(&self, other: &ConstraintKind) -> 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 StructuralPartialEq for ConstraintKind