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Re: Unions in Obj-C Code
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Re: Unions in Obj-C Code


  • Subject: Re: Unions in Obj-C Code
  • From: Brian Bergstrand <email@hidden>
  • Date: Tue, 3 Apr 2007 23:29:26 -0500

Objective-C is not C++ (it can be in .mm files though), you have allocate your union with the union keyword or create a typedef just like straight C:

{
	BOOL result = NO;
	union serial_buff s;
	...
}

On Apr 3, 2007, at 10:44 PM, Mike wrote:

Are unions supported in Obj-C? If so is there anything special I have to do to use them?

In my .h file I define a union like this:

typedef struct
{
   char        type;
   char        version;
   char        oem[ SER_OEM_SIZE ];
   char        alpha_chk[ 2 ];
   char        number[ SER_NUM_SIZE ];
   char        crc[ 2 ];
} serial_rec;

union serial_buff
{
   serial_rec    s;
   char        c[ sizeof( serial_rec ) ];
};

I then import that.h file into my .m file but any time I try to use the union I get an error on the declaration of my union serial_buff s:

- (BOOL)_validateSerialNumberAlpha:(char*)pserial_number
{
   BOOL            result = NO;
   serial_buff        s;

memset( &s, 0, sizeof( s ) );
memmove( s.c, pserial_number, ( strlen( pserial_number ) > sizeof( s.c )) ? sizeof( s.c ) : strlen( pserial_number ) );
.
.
.



Brian Bergstrand <http://www.bergstrand.org/brian/> PGP Key ID: 0xB6C7B6A2

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References: 
 >Unions in Obj-C Code (From: Mike <email@hidden>)

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