PredicateBindings

struct · iOS 17.0+ · SDK 27.1

struct PredicateBindings

A mapping from a predicates's input variables to their values. If you define a custom predicate expression type, you must propagate the predicate's bindings to its subexpressions. If you define a custom predicate type, you must create an instance of this structure, populate it with the predicate's variables, and propagate it throughout the expression tree.

Members (2)

binding(variable: PredicateExpressions_Variable<unknown>, value: unknown): PredicateBindings

func binding<T>(_ variable: PredicateExpressions.Variable<T>, to value: T) -> PredicateBindings

subscript(variable: PredicateExpressions_Variable<unknown>): (unknown) | null

subscript<T>(variable: PredicateExpressions.Variable<T>) -> T? { get set }

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