Objective-C与C ++中的Typedef要求

Question

From my reading, I am gathering that you don't need typedef in C++ in the same way you do in Objective-C. For example, in C++ you can do this:

enum Order {first,second,third};
Order myOrder;
myOrder=first;

But in Objective-C, the line Order myOrder; would first require a typedef :

typedef enum {first,second,third} Order; //noting also the placement of Order at the end
Order myOrder;
myOrder=first;

Correct? Without the typedef in Objective-C you'd have to define myOrder by repeating the enum :

enum Order {first,second,third};
enum Order myOrder;
myOrder=first;

If in fact this is all correct, I find it a bit odd that there is this type of syntactic differences in the languages, since both are based on C and none of this is unique to the object-oriented natures of the languages, thus should be just straight CI would think.

Answer 1

Actually that's not strange at all, Objective-C is a superset of C and in C you must use the keyword enum again (as for the keyword struct ) so that's coherent.

If you want the agile version switch to Objective-C++ which, being a superset of C++ allows the less verbose version without the requirement of a typedef .

Actually Objective-C is not based on C, it is C + Obective-C so it's a real extension to it.