CODEWITHSUNDEEP
xcodexcode4xcode4.2
ninjaneer
ninjaneer

Reputation: 7031

Xcode 4.2 switch statement bug?

enter image description here

BUT! add a random statement before:

enter image description here

Any thoughts?

Upvotes: 1

Views: 1089

Answers (2)

Vincent
Vincent

Reputation: 4409

Just checked Kernighan&Ritchie for this. In the C specification is no line describing that a declaration in the the first statement of a 'case' is not allowed.

However most people consider it good programming to not declare values in a 'case'.

I think that the b) issue from EXC_BAD_ACCESS in statement block in Switch impact on imageViewPoistion is related to the same bug.

Upvotes: 0

Jason Coco
Jason Coco

Reputation: 78343

This isn't a switch-statement bug, it's a limitation in the C language. In C, the first statement after a case label cannot be a variable declaration. You can get around this by either declaring the variables before the switch statement or creating the variable inside a block of code (see below). Obviously, you can also re-order your code (if possible) so that another statement comes before the variable declaration.

Example 1:

CGRect newRect = CGRectZero;
switch( var ) {
  case 0:
    // do some stuff
    break;
  case 1:
  default:
    newRect = [someVar someMethodThatReturnsARect];
    // other code
    break;
}

Example 2:

switch( var ) {
  case 0:
    // do some stuff
    break;
  case 1:
  default: {
    CGRect newRect = [someVar someMethodThatReturnsARect];
    // other code
    break;
  }
}

Example 3:

switch( var ) {
  case 0:
    // do some stuff
    break;
  case 1:
  default:
    // some code re-ordered to here
    CGRect newRect = [someVar someMethodThatReturnsARect];
    // rest of the other code
    break;
}

Upvotes: 2

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