Creates an array with the specified capacity, then calls the given closure with a buffer covering the array’s uninitialized memory.
init(unsafeUninitializedCapacity: Int, initializingWith initializer: (inout UnsafeMutableBufferPointer<Element>, inout Int) throws -> Void) rethrows
The number of elements to allocate space for in the new array.
A closure that initializes elements and sets the count of the new array.
buffer: A buffer covering uninitialized memory with room for the specified number of elements.
initializedCount: The count of initialized elements in the array, which begins as zero. Set
initializedCountto the number of elements you initialize.
Inside the closure, set the
initializedCount parameter to the number of elements that are initialized by the closure. The memory in the range
buffer[0..<initializedCount] must be initialized at the end of the closure’s execution, and the memory in the range
buffer[initializedCount...] must be uninitialized. This postcondition must hold even if the
initializer closure throws an error.