How to declare a typedef enum of structs in Objective-C if possible

Question

In order to be able to limit the positions to a list of available positions I tried the following declaration:

typedef enum
{
    feedbackPositionMiddle = {20.f,80.f},
    feedBackPositionTop    = {20.f,40.f},
    feedBackPositionBottom = {20.f,120.f}

} feedBackPosition;

However this code does not seems to be accepted. Does it misses something or is it just impossible?

http://stackoverflow.com/questions/707512/what-is-a-typedef-enum-in-objective-c — Valentin Shamardin, Jun 11 '14 at 10:09
good news is you can do it in Swift. bad news is you can't do it in ObjC/C++ — Bryan Chen, Jun 11 '14 at 10:14
@BryanChen, afaik in swift you can provide raw values for enum only as literals, so creating 'enum MyPoint : CGPoint' is not possible in swift either — Vladimir, Jun 11 '14 at 10:23
ha… who will dig the doc to be right :) from what I read if I remember well enum can be of anything even class and.. no it was switch that can be done on anything — Nicolas Manzini, Jun 11 '14 at 10:25
@Vladimir Yes only as literals. However, it is possible to write extension to convert literals to CGPoint — Bryan Chen, Jun 11 '14 at 10:30
@Vladimir check this: http://stackoverflow.com/questions/24161108/how-to-create-enum-with-raw-type-of-cgpoint/24161109#24161109 — Bryan Chen, Jun 11 '14 at 10:54
@BryanChen, something like https://gist.github.com/vlk/3d74933d58f590f9bde2, or can it be done in a nicer way? — Vladimir, Jun 11 '14 at 10:54

score 3 · Accepted Answer · answered Jun 11 '14 at 10:12

3

You can declare enum only of integral type, so struct or any other composite type is not allowed here. In your case const CGPoint is probably the best option:

const CGPoint kFeedbackPositionMiddle = {20.f,80.f};
...

answered Jun 11 '14 at 10:12

Vladimir

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Indeed my question was more something like can we create enum of something else than integral type. thanks, I wanted to avoid the const... – Nicolas Manzini Jun 11 '14 at 10:13

How to declare a typedef enum of structs in Objective-C if possible

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