init?<U>(UnsafeMutablePointer<U>?) Explicit construction from an UnsafeMutablePointer.
UnsafeMutablePointerからの明示的な組み立て。
Discussion 解説
This is inherently unsafe; UnsafeMutablePointer assumes the referenced memory has +1 strong ownership semantics, whereas AutoreleasingUnsafeMutablePointer implies +0 semantics. これは、本質的に安全ではありません；UnsafeMutablePointerは参照されるメモリが+1の強力な所有権意味論を持つことを仮定します、そういうわけでAutoreleasingUnsafeMutablePointerは必然的に+0意味論です。