• Ellery Newcomer (14/14) Oct 10 2009 This is probably a bad idea, but from my readings of the dmd source, I
• Jeremie Pelletier (8/28) Oct 10 2009 D supports case ranges:
• Jarrett Billingsley (8/22) Oct 10 2009 A single string mixin must consist of an entire, fully-formed
• Ellery Newcomer (10/21) Oct 10 2009 Yeah they do. Ever wonder why you can do things like duff's device? Or
• Christopher Wright (3/12) Oct 10 2009 No, you can put multiple case labels together. A case "statement" is
• Ellery Newcomer (4/17) Oct 10 2009 We're probably thinking on different levels. I'm down on the syntactic

Ellery Newcomer <ellery-newcomer utulsa.edu> writes:

This is probably a bad idea, but from my readings of the dmd source, I
noticed some preprocessor defines that looked useful, along the lines of

#define CASES case A:case B: (etc)

I'd kinda like something similar in D, but a naive attempt with mixins
doesn't work, e.g.

immutable string cases = "case 1: case 2:"; //my d2fu sucks

..

switch(x){
    mixin(cases);
      dosomething();
    default:
      dosomething();
}

Any ideas (not including concatenating cases with body of case)?

Jeremie Pelletier <jeremiep gmail.com> writes:

Ellery Newcomer wrote:
 This is probably a bad idea, but from my readings of the dmd source, I
 noticed some preprocessor defines that looked useful, along the lines of
 
 #define CASES case A:case B: (etc)
 
 I'd kinda like something similar in D, but a naive attempt with mixins
 doesn't work, e.g.
 
 immutable string cases = "case 1: case 2:"; //my d2fu sucks
 
 ..
 
 switch(x){
     mixin(cases);
       dosomething();
     default:
       dosomething();
 }
 
 Any ideas (not including concatenating cases with body of case)?

D supports case ranges:

switch(x) {
	case 1: .. case 10:
		doSomething();
	default:
		doSomething();
}

Jarrett Billingsley <jarrett.billingsley gmail.com> writes:

On Sat, Oct 10, 2009 at 8:45 PM, Ellery Newcomer
<ellery-newcomer utulsa.edu> wrote:
 This is probably a bad idea, but from my readings of the dmd source, I
 noticed some preprocessor defines that looked useful, along the lines of

 #define CASES case A:case B: (etc)

 I'd kinda like something similar in D, but a naive attempt with mixins
 doesn't work, e.g.

 immutable string cases =3D "case 1: case 2:"; //my d2fu sucks

 ..

 switch(x){
 =A0 =A0mixin(cases);
 =A0 =A0 =A0dosomething();
 =A0 =A0default:
 =A0 =A0 =A0dosomething();
 }

 Any ideas (not including concatenating cases with body of case)?

A single string mixin must consist of an entire, fully-formed
statement, expression, or declaration (depending on where it's used).
Case labels do not, on their own, count as a statement.

In addition, there is a bug that prevents you from string-mixing-in
cases inside a switch. For some reason you have to mix in the entire
switch statement.

Ellery Newcomer <ellery-newcomer utulsa.edu> writes:

Jarrett Billingsley wrote:
 On Sat, Oct 10, 2009 at 8:45 PM, Ellery Newcomer
 <ellery-newcomer utulsa.edu> wrote:
 This is probably a bad idea

 
 A single string mixin must consist of an entire, fully-formed
 statement, expression, or declaration (depending on where it's used).
 Case labels do not, on their own, count as a statement.

Yeah they do. Ever wonder why you can do things like duff's device? Or

case 1:
case 2:

or

switch(x){
case 3:
}

 
 In addition, there is a bug that prevents you from string-mixing-in
 cases inside a switch. For some reason you have to mix in the entire
 switch statement.


http://d.puremagic.com/issues/show_bug.cgi?id=1534

Hey! there's even a patch for it! And it works! Rainier, you da man!

Christopher Wright <dhasenan gmail.com> writes:

Ellery Newcomer wrote:
 Jarrett Billingsley wrote:
 On Sat, Oct 10, 2009 at 8:45 PM, Ellery Newcomer
 <ellery-newcomer utulsa.edu> wrote:
 This is probably a bad idea

 A single string mixin must consist of an entire, fully-formed
 statement, expression, or declaration (depending on where it's used).
 Case labels do not, on their own, count as a statement.

 
 Yeah they do. Ever wonder why you can do things like duff's device? Or

No, you can put multiple case labels together. A case "statement" is 
just a special category of label.

Ellery Newcomer <ellery-newcomer utulsa.edu> writes:

Christopher Wright wrote:
 Ellery Newcomer wrote:
 Jarrett Billingsley wrote:
 On Sat, Oct 10, 2009 at 8:45 PM, Ellery Newcomer
 <ellery-newcomer utulsa.edu> wrote:
 This is probably a bad idea

 A single string mixin must consist of an entire, fully-formed
 statement, expression, or declaration (depending on where it's used).
 Case labels do not, on their own, count as a statement.

 Yeah they do. Ever wonder why you can do things like duff's device? Or

 
 No, you can put multiple case labels together. A case "statement" is
 just a special category of label.

We're probably thinking on different levels. I'm down on the syntactic
level. parseStatement(flag) can parse 'case x:' and nothing more if
there's nothing more.