initialize(fromContentsOf:)
Initializes the buffer’s memory with every element of the source.
Declaration
func initialize(fromContentsOf source: some Collection<Element>) -> UnsafeMutableBufferPointer<Element>.IndexParameters
- source:
A collection of elements to be used to initialize the buffer’s storage.
Return Value
The index one past the last element of the buffer initialized by this function.
Discussion
Prior to calling the initialize(fromContentsOf:) method on a buffer, the memory referenced by the buffer must be uninitialized, or the Element type must be a trivial type. After the call, the memory referenced by the buffer up to, but not including, the returned index is initialized. The buffer must reference enough memory to accommodate source.count elements.
The returned index is the position of the next uninitialized element in the buffer, one past the index of the last element written. If source contains no elements, the returned index is equal to the buffer’s startIndex. If source contains as many elements as the buffer can hold, the returned index is equal to the buffer’s endIndex.