withProjectedValues(of___)

withProjectedValues(of:_:)

Projects erased values' dynamic types and initialized storage for the duration of body.

public func withProjectedValues<Result>(
  of instances: [Any],
  _ body: ([(type: Any.Type, storage: UnsafeRawPointer)]) throws -> Result
) rethrows -> Result 

Each storage pointer is valid only while body executes. In particular, callers must not retain a pointer or use it to materialize a value for a different existential or ABI representation. This is useful when one synchronous operation needs several dynamically typed source values to remain alive at once.

Parameters

• instances: Erased Swift values to project.
• body: Receives each value's dynamic type and initialized storage in the same order as instances.

Returns

The result of body.