Re: request switch statement with common block

[Andrei Alexandrescu]

On 8/3/13 10:21 AM, JS wrote:
On Saturday, 3 August 2013 at 16:16:24 UTC, Ary Borenszweig wrote:
On 8/3/13 11:38 AM, JS wrote:

switch (cond)
    common: always executed code here
    case A : etc...
    ....
}

instead of

if (cond) { always executed code here  }
switch (cond)
    case A : etc...
    ....
}

which requires modification of the condition twice when necessary

Do you mean this?

switch(cond) {
  case A:
    common_code();
    // something
  case B:
    common_code();
    // something else
}

(common_code() must not be executed if it doesn't hit any switch case)

exactly

No because your initial rewrite suggested zero is special. But zero has 
no special meaning to the switch statement. Consider:

switch (cond)
{
common: ...
case 0: ...
...
}


Andrei