Objective C global constants with case/switch

constants, ios, objective-c, switch-statement

Solution

I usually use enumerations with typedef statements when using constants which I will use in a switch statement.

For example, this would be in a shared .h file such as ProjectEnums.h:

enum my_custom_unit
{
    MyCustomUnitIdle    = 1,
    MyCustomUnitDefend  = 2
};
typedef enum my_custom_unit MyCustomUnit;

I can then use code similar to the following switch statement in my .c, .m, .cpp files:

#import "ProjectEnums.h"

- (void) useUnit:(MyCustomUnit)unit
{
    switch(unit)
    {
        case MyCustomUnitIdle:
        /* do something */
        break;

        case MyCustomUnitDefend:
        /* do something else */
        break;

        default:
        /* do some default thing for unknown unit */
        break;
    };
    return;
};

This also allows the compiler to verify the data being passed to the method and used within the switch statement at compile time.

Problem

Is there any way to use global int constants in Objective C that work in a case/switch statement? The technique here (http://stackoverflow.com/questions/538996/constants-in-objective-c) lets me access the constants everywhere, but does not let me put them into a switch statement. in .h ``` FOUNDATION_EXPORT const int UNIT_IDLE; FOUNDATION_EXPORT const int UNIT_DEFEND; ``` in .m ``` int const UNIT_IDLE = 0; int const UNIT_DEFEND = 1; ``` Error is "Expression is not an integer constant expression"

Original source

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