On 09/14/2011 09:11 PM, bearophile wrote:
simendsjo Wrote:
Not sure if this is a bug or as intended.
The semantics of switch is a mess (example: see
http://d.puremagic.com/issues/show_bug.cgi?id=3820 ).
Mixing labels and switch cases seems a good way to create a bigger mess.
I think it is a bit mean to say the whole semantics is a mess, because
there is an accepts-invalid bug. ;) What is really nice about D's case
labels, is that they introduce a new scope. (as opposed to C) Unless
they are mixed in: http://d.puremagic.com/issues/show_bug.cgi?id=6590 .
switch statements and gotos provide nice means of writing highly
efficient code that still looks somewhat structured. I don't agree that
using labels inside a switch creates a mess.
If I invert some things in your code I get an error...
import std.stdio;
void main() {
int i = 1;
switch(i) {
case 0:
writeln("case 0");
goto default; // needed here
aLabel:
writeln("a label");
default:
writeln("default");
// But always falls through here
}
}
Bye,
bearophile
Well, yes, but that is as expected. Would you expect a fall through
error on this code?
writeln(1);
label:
writeln(2);
labeled statements and case/default statements are not the same thing.
