swift指针及内存管理内存绑定实例详解_Swift

func testPointer(_ p: UnsafePointer<Int>) {
    print(p)
}
let tuple = (30, 40)
withUnsafePointer(to: tuple) { (tuplePtr: UnsafePointer<(Int, Int)>) in
    testPointer(UnsafeRawPointer(tuplePtr)
    .assumingMemoryBound(to: Int.self))
}

func testPointer(_ p: UnsafePointer<Int>) {
    print(p[0])
    print(p[1])
}
let tuple = (30, 40)
withUnsafePointer(to: tuple) { (tuplePtr: UnsafePointer<(Int, Int)>) in
    testPointer(UnsafeRawPointer(tuplePtr).assumingMemoryBound(to: Int.self))
}

func testPointer(_ p: UnsafePointer<Int>) {
    print(p[0])
    print(p[1])
}
let tuple = (30, 40)
withUnsafePointer(to: tuple) { (tuplePtr: UnsafePointer<(Int, Int)>) in
    testPointer(UnsafeRawPointer(tuplePtr)
    .bindMemory(to: Int.self, capacity: 1))
}

func testPointer(_ p: UnsafePointer<Int8>) {
    print(p)
}
let UInt8Ptr = UnsafePointer<UInt8>.init(bitPattern: 30)
UInt8Ptr?.withMemoryRebound(to: Int8.self, capacity: 1, 
	{ (Int8Ptr: UnsafePointer<Int8>) in
    testPointer(Int8Ptr)
})