• Paul (15/15) Jun 14 2012 The book in section 3.5 gives these valid case examples:
• Timon Gehr (23/38) Jun 14 2012 case-range expressions don't work with strings. (because there is no
• Paul (3/52) Jun 14 2012 What are those examples I quoted from the book? Aren't they
• bearophile (4/8) Jun 14 2012 Those are char ranges.
• Paul (2/11) Jun 14 2012 Thanks.

"Paul" <phshaffer gmail.com> writes:

The book in section 3.5 gives these valid case examples:

case ’0’: .. case ’9’:
case ’A’: .. case ’Z’: case ’a’: .. case ’z’:
case ’.’, ’,’, ’:’, ’;’, ’!’, ’?’:

In my code:

case "STEP01": ...compiles and works correct
case "STEP01", "STEP02": ...compiles and works correct
case "STEP01": .. case "STEP50": ...compiler reports:

iccstats.d(27): Error: Integer constant expression expected 
instead of "STEP01"
iccstats.d(27): Error: Integer constant expression expected 
instead of "STEP50"
iccstats.d(27): Error: integral constant must be scalar type, not 
const(char[])

Help please.

Timon Gehr <timon.gehr gmx.ch> writes:

On 06/14/2012 05:59 PM, Paul wrote:
 The book in section 3.5 gives these valid case examples:

 case ’0’: .. case ’9’:
 case ’A’: .. case ’Z’: case ’a’: .. case ’z’:
 case ’.’, ’,’, ’:’, ’;’, ’!’, ’?’:

 In my code:

 case "STEP01": ...compiles and works correct
 case "STEP01", "STEP02": ...compiles and works correct
 case "STEP01": .. case "STEP50": ...compiler reports:

 iccstats.d(27): Error: Integer constant expression expected instead of
 "STEP01"
 iccstats.d(27): Error: Integer constant expression expected instead of
 "STEP50"
 iccstats.d(27): Error: integral constant must be scalar type, not
 const(char[])

 Help please.

case-range expressions don't work with strings. (because there is no 
general way to meaningfully fill in the gap.)

You could automatically generate the case statements via a string mixin 
(untested):

mixin({
     string r;
     foreach(i;1..51) r~=`case "STEP`~(i<10?"0":"")~to!string(i)~`":`;
     return r;
}());

But that is probably overkill, why not just parse the string with an if 
statement?

If you need fallthrough, you can use a goto statement

if(...) goto Lstepn;
switch(...){
     case ...:
         ...
         break;
     Lstepn:
     case ...:
         ...
         break;
}

"Paul" <phshaffer gmail.com> writes:

On Thursday, 14 June 2012 at 16:16:19 UTC, Timon Gehr wrote:
 On 06/14/2012 05:59 PM, Paul wrote:
 The book in section 3.5 gives these valid case examples:

 case ’0’: .. case ’9’:
 case ’A’: .. case ’Z’: case ’a’: .. case ’z’:
 case ’.’, ’,’, ’:’, ’;’, ’!’, ’?’:

 In my code:

 case "STEP01": ...compiles and works correct
 case "STEP01", "STEP02": ...compiles and works correct
 case "STEP01": .. case "STEP50": ...compiler reports:

 iccstats.d(27): Error: Integer constant expression expected 
 instead of
 "STEP01"
 iccstats.d(27): Error: Integer constant expression expected 
 instead of
 "STEP50"
 iccstats.d(27): Error: integral constant must be scalar type, 
 not
 const(char[])

 Help please.

 case-range expressions don't work with strings. (because there 
 is no general way to meaningfully fill in the gap.)

 You could automatically generate the case statements via a 
 string mixin (untested):

 mixin({
     string r;
     foreach(i;1..51) r~=`case 
 "STEP`~(i<10?"0":"")~to!string(i)~`":`;
     return r;
 }());

 But that is probably overkill, why not just parse the string 
 with an if statement?

 If you need fallthrough, you can use a goto statement

 if(...) goto Lstepn;
 switch(...){
     case ...:
         ...
         break;
     Lstepn:
     case ...:
         ...
         break;
 }

What are those examples I quoted from the book?  Aren't they 
string ranges?

 case ’0’: .. case ’9’:
 case ’A’: .. case ’Z’: case ’a’: .. case ’z’:

"bearophile" <bearophileHUGS lycos.com> writes:

Paul:

 What are those examples I quoted from the book?  Aren't they 
 string ranges?

 case ’0’: .. case ’9’:
 case ’A’: .. case ’Z’: case ’a’: .. case ’z’:



Those are char ranges.

Bye,
bearophile

"Paul" <phshaffer gmail.com> writes:

On Thursday, 14 June 2012 at 16:49:16 UTC, bearophile wrote:
 Paul:

 What are those examples I quoted from the book?  Aren't they 
 string ranges?

 case ’0’: .. case ’9’:
 case ’A’: .. case ’Z’: case ’a’: .. case ’z’:



 Those are char ranges.

 Bye,
 bearophile

Thanks.