Generic Function

withExtendedLifetime(_:_:)

Evaluates a closure while ensuring that the given instance is not destroyed before the closure returns.

Declaration

func withExtendedLifetime<T, Result>(_ x: T, _ body: (T) throws -> Result) rethrows -> Result

Parameters

x: An instance to preserve until the execution of body is completed.
body: A closure to execute that depends on the lifetime of x being extended. If body has a return value, that value is also used as the return value for the withExtendedLifetime(_:_:) method.

Return Value

The return value, if any, of the body closure parameter.

See Also

Reference Counting

struct Unmanaged

A type for propagating an unmanaged object reference.

func withExtendedLifetime<T, Result>(T, () -> Result) -> Result

Evaluates a closure while ensuring that the given instance is not destroyed before the closure returns.