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Question

Are there any C compilers with extensions that provide the ability to automatically break at the end of each case statement (similar to what Swift has available) or an alterate switch available in a future C spec?

Mostly interested in this to avoid clutter in extensive switch-case scenarios.

I find this works "ok" but would prefer something clearer about the behavior.

#define case   break; { } case
#define switch_break switch

switch_break (action) 
{
    default: printf ("Unknown action");

    case action_none   :   // Nothing
    case action_copy   :   doCopy ();
    case action_paste  :   doPaste ();         
    case action_none   :   break;  /* C requires a statement after final case */

}

Answer 1

If you hate writing break everytime, wrap the switch statement inside a function. Then break can be replaced with return statements. For example

int switch_func(char c) {
    switch(c) {
        case 'a': return 1;
        case 'b': return 3;
        case 'c': return 5;
        case 'd': return 7;
        . . .
        default: return 0;
    }
}

Reduces code only if return values are present.