Can an objective C method signature specify an enum type?

Question

"VoiceName" is an enum, declared like this:

enum VoiceName {
 PAD_RHYTHM,
 PAD_RHYTHM2,
 PAD_RHYTHM3,
 PEEPERS,
 ATMOSPHERE,
 IMPULSE,
 FAST_PULSE,
 HAIRYBALLS_PADS,
 KICK
};

The compiler doesn't seem to like me using it in a method signature like this:

-(void)pulseFiredWithSamplePosition:(float)position from: (VoiceName) voiceName;

It tells me expected ')' before 'VoiceName'. What's going on here?

possible duplicate of [Can an objective C method signature specify an enum type?](http://stackoverflow.com/questions/3723136/can-an-objective-c-method-signature-specify-an-enum-type) — Adam Rosenfield, Sep 16 '10 at 01:45

score 8 · Accepted Answer · answered Sep 16 '10 at 01:47

8

You can't use it "bare" like that without also specifying that it's an enum:

-(void)pulseFiredWithSamplePosition:(float)position from: (enum VoiceName) voiceName;

should work. If you want to avoid specifying it like that, you can typedef it:

typedef enum _VoiceName {
    PAD_RHYTHM,
    ....
} VoiceName;

then you'll be able to use just VoiceName as the argument type.

answered Sep 16 '10 at 01:47

Ben Zotto

70,108
23
141
204

1

I use the shorter form: `enum { … } typedef VoiceName;`. ;-) – Constantino Tsarouhas Dec 11 '11 at 18:41

score 2 · Answer 2 · answered Mar 01 '14 at 15:04

As of iOS6 and Mac OSX 10.8 you can use the NS_ENUM macro

typedef NS_ENUM(NSUInteger, VoiceName)
{
 PAD_RHYTHM,
 PAD_RHYTHM2,
 PAD_RHYTHM3,
 PEEPERS,
 ATMOSPHERE,
 IMPULSE,
 FAST_PULSE,
 HAIRYBALLS_PADS,
 KICK
};

NSUInteger can be replaced with whatever type your defining, then you could use your method as specified.

score 1 · Answer 3 · answered Sep 16 '10 at 02:10

1

Obj-C is based on C, not C++. C requires the enum keyword, as quixoto showed. C++ lets you omit it.

answered Sep 16 '10 at 02:10

Graham Perks

23,007
8
61
83

Can an objective C method signature specify an enum type?

3 Answers3

Linked

Related