What does the symbol ^ mean in Objective-C? [duplicate]

This question already has answer开发者_JAVA技巧s here: Closed 11 years ago.

Possible Duplicate:

Caret in objective C

I just want to know what this ^ symbol means in Objective-C.

---

It can mean several things:

type (^name)(arguments)

is a declaration of a block object.

^(arguments) { ... }

is a block object literal

x ^ y

is the bitwise XOR operator

---

It is used to define blocks in later versions of iOS. See http://developer.apple.com/library/ios/#documentation/cocoa/Conceptual/Blocks/Articles/00_Introduction.html

---

It means a couple of things:

1. It can mean bitwise XOR.
2. It can also signify a pointer to a block (just like * is marks a pointer to a function).