iphone - 如何获取指向 id 变量和 NSObject 指针的指针？

Question

id        idPointer = [[SomeObject alloc] init];
NSObject *nsPointer = [[SomeObject alloc] init];

如何获取idPointer和nsPointer的指针？

Answer 1

要获取指向指针的指针，只需要在变量上添加一个额外的 * 即可。为了分配它们，您通常会获得普通指针&的地址。然后再次取消引用它们，并在前面加上 *。

//Declare and Assign them
id       *idPointerPointer = &idPointer;
NSObject **nsPointerPointer = &nsPointer;

//Dereference them (just an example to send a message)
[*idPointerPointer release];
[*nsPointerPointer release];