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Is there a way to declare a function argument to take an anonymous enum?

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8

If I have an anonymous enum, is there any way to pass a value of that type to a function? For example,

typedef struct 
 enum On, Off status;
 int max_amps;
 SWITCH;

void make_switches()
 SWITCH switch1 = createSwitch( On, 15 );
 SWITCH switch2 = createSwitch( Off, 20 );


SWITCH* createSwitch( ??? status, int max_amps )
 SWITCH* new_switch = malloc( sizeof( SWITCH ) );
 new_switch->status = status;
 new_switch->max_amps = max_amps;
 return new_switch;

I would like to pass the value of the anonymous enum into the createSwitch() function. Is there any way to do this?

c enums

share|improve this question

asked Apr 12 at 3:39

Tyler DurdenTyler Durden

7,25074096

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I'm sure you already thought of this, but my suggestion is to promote the enum to be a global, named type.
  
  – Tom Karzes
  Apr 12 at 3:52
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Sure, you can SWITCH *createSwitch(int status...)
  
  – Mark Benningfield
  Apr 12 at 3:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The value of an enumeration is similar to an integer, you can accept status as any type of integer
  
  – liamcomp
  Apr 12 at 3:52
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Replacing ??? with typeof(On) is a really bad idea for many reasons, not the least of which is that it isn't mentioned in the C specification. See also: stackoverflow.com/questions/12081502/typeof-operator-in-c
  
  – user3386109
  Apr 12 at 3:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user3386109: I guess I'm blind; where do you seetypeof(On) ?
  
  – Mark Benningfield
  Apr 12 at 3:56
  

  
  
  
  

 | 
show 2 more comments

8

If I have an anonymous enum, is there any way to pass a value of that type to a function? For example,

typedef struct 
 enum On, Off status;
 int max_amps;
 SWITCH;

void make_switches()
 SWITCH switch1 = createSwitch( On, 15 );
 SWITCH switch2 = createSwitch( Off, 20 );


SWITCH* createSwitch( ??? status, int max_amps )
 SWITCH* new_switch = malloc( sizeof( SWITCH ) );
 new_switch->status = status;
 new_switch->max_amps = max_amps;
 return new_switch;

I would like to pass the value of the anonymous enum into the createSwitch() function. Is there any way to do this?

c enums

share|improve this question

asked Apr 12 at 3:39

Tyler DurdenTyler Durden

7,25074096

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I'm sure you already thought of this, but my suggestion is to promote the enum to be a global, named type.
  
  – Tom Karzes
  Apr 12 at 3:52
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Sure, you can SWITCH *createSwitch(int status...)
  
  – Mark Benningfield
  Apr 12 at 3:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The value of an enumeration is similar to an integer, you can accept status as any type of integer
  
  – liamcomp
  Apr 12 at 3:52
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Replacing ??? with typeof(On) is a really bad idea for many reasons, not the least of which is that it isn't mentioned in the C specification. See also: stackoverflow.com/questions/12081502/typeof-operator-in-c
  
  – user3386109
  Apr 12 at 3:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user3386109: I guess I'm blind; where do you seetypeof(On) ?
  
  – Mark Benningfield
  Apr 12 at 3:56
  

  
  
  
  

 | 
show 2 more comments

If I have an anonymous enum, is there any way to pass a value of that type to a function? For example,

typedef struct 
 enum On, Off status;
 int max_amps;
 SWITCH;

void make_switches()
 SWITCH switch1 = createSwitch( On, 15 );
 SWITCH switch2 = createSwitch( Off, 20 );


SWITCH* createSwitch( ??? status, int max_amps )
 SWITCH* new_switch = malloc( sizeof( SWITCH ) );
 new_switch->status = status;
 new_switch->max_amps = max_amps;
 return new_switch;

I would like to pass the value of the anonymous enum into the createSwitch() function. Is there any way to do this?

c enums

share|improve this question

asked Apr 12 at 3:39

Tyler DurdenTyler Durden

7,25074096

typedef struct 
 enum On, Off status;
 int max_amps;
 SWITCH;

void make_switches()
 SWITCH switch1 = createSwitch( On, 15 );
 SWITCH switch2 = createSwitch( Off, 20 );


SWITCH* createSwitch( ??? status, int max_amps )
 SWITCH* new_switch = malloc( sizeof( SWITCH ) );
 new_switch->status = status;
 new_switch->max_amps = max_amps;
 return new_switch;

share|improve this question

asked Apr 12 at 3:39

Tyler DurdenTyler Durden

7,25074096

share|improve this question

asked Apr 12 at 3:39

Tyler DurdenTyler Durden

7,25074096

asked Apr 12 at 3:39

Tyler DurdenTyler Durden

7,25074096

asked Apr 12 at 3:39

Tyler DurdenTyler Durden

7,25074096

1 Answer
1

active

oldest

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10

As others have suggested, you can simply use an int in the place of ???.

This is because as per 6.7.2.2/3 of C11 standard (Committee draft):

The identifiers in an enumerator list are declared as constants that have type int and may appear wherever such are permitted.

share|improve this answer

edited Apr 12 at 10:53

answered Apr 12 at 4:26

P.WP.W

19.1k41860

add a comment | 

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10

As others have suggested, you can simply use an int in the place of ???.

This is because as per 6.7.2.2/3 of C11 standard (Committee draft):

The identifiers in an enumerator list are declared as constants that have type int and may appear wherever such are permitted.

share|improve this answer

edited Apr 12 at 10:53

answered Apr 12 at 4:26

P.WP.W

19.1k41860

add a comment | 

10

As others have suggested, you can simply use an int in the place of ???.

This is because as per 6.7.2.2/3 of C11 standard (Committee draft):

The identifiers in an enumerator list are declared as constants that have type int and may appear wherever such are permitted.

share|improve this answer

edited Apr 12 at 10:53

answered Apr 12 at 4:26

P.WP.W

19.1k41860

add a comment | 

As others have suggested, you can simply use an int in the place of ???.

This is because as per 6.7.2.2/3 of C11 standard (Committee draft):

The identifiers in an enumerator list are declared as constants that have type int and may appear wherever such are permitted.

share|improve this answer

edited Apr 12 at 10:53

answered Apr 12 at 4:26

P.WP.W

19.1k41860

share|improve this answer

edited Apr 12 at 10:53

answered Apr 12 at 4:26

P.WP.W

19.1k41860

answered Apr 12 at 4:26

P.WP.W

19.1k41860

answered Apr 12 at 4:26

P.WP.W

19.1k41860