www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.bugs - Issue

reply bobef <bobef nosmap-abv.bg> writes:
DMD 1.033:

import tango.io.Stdout;

void a(void delegate() dg)
{
	dg();
}

void b(char[][] bb)
{
	Stdout(bb);
}

void main(char[][] argv)
{
//why:
	{Stdout(argv);}.a(); //this is not working
	argv.b(); //and this is working?
}

Regards, bobef
Jul 17 2008
next sibling parent bobef <bobef nosmap-abv.bg> writes:
Ultimately I want to be able to do something like this:

bool silent(T,ARGS...)(T delegate(ARGS) dgTry,ARGS args)
{
	try {
		dgTry(args);
		return true;
	}
	catch(Object o) return false;
}

delegate(whatever W){W.dosomething();}.silent(somevar);

Prototype like programming is very nice :)

Regards, bobef
Jul 17 2008
prev sibling next sibling parent reply "Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"bobef" <bobef nosmap-abv.bg> wrote in message 
news:g5o6c5$2is4$1 digitalmars.com...

 DMD 1.033:

 import tango.io.Stdout;

 void a(void delegate() dg)
 {
 dg();
 }

 void b(char[][] bb)
 {
 Stdout(bb);
 }

 void main(char[][] argv)
 {
 //why:
 {Stdout(argv);}.a(); //this is not working
 argv.b(); //and this is working?
 }



Because the "a.f() == f(a)" only works for arrays and associative arrays and 
not delegates.
Jul 17 2008
parent reply bobef <bobef nosmap-abv.bg> writes:
Jarrett Billingsley Wrote:


 "bobef" <bobef nosmap-abv.bg> wrote in message 
 news:g5o6c5$2is4$1 digitalmars.com...

 DMD 1.033:

 import tango.io.Stdout;

 void a(void delegate() dg)
 {
 dg();
 }

 void b(char[][] bb)
 {
 Stdout(bb);
 }

 void main(char[][] argv)
 {
 //why:
 {Stdout(argv);}.a(); //this is not working
 argv.b(); //and this is working?
 }



 Because the "a.f() == f(a)" only works for arrays and associative arrays and 
 not delegates. 
 
 



Obviously. And why is that? If it is working for one primitive type I see no
reason it shouldn't work for the rest.
Jul 17 2008
parent reply Bill Baxter <dnewsgroup billbaxter.com> writes:
bobef wrote:

 Jarrett Billingsley Wrote:
 

 "bobef" <bobef nosmap-abv.bg> wrote in message 
 news:g5o6c5$2is4$1 digitalmars.com...

 DMD 1.033:

 import tango.io.Stdout;

 void a(void delegate() dg)
 {
 dg();
 }

 void b(char[][] bb)
 {
 Stdout(bb);
 }

 void main(char[][] argv)
 {
 //why:
 {Stdout(argv);}.a(); //this is not working
 argv.b(); //and this is working?
 }



 not delegates. 



 Obviously. And why is that? If it is working for one primitive type I see no
reason it shouldn't work for the rest.



It was originally just an unadvertised easter egg that it worked for any 
type at all.  It was not in the spec at all for a long time, but I guess 
since the experiment seemed to be a success, Walter decided to put it in.

Making it work for all types is on the to-do list for D2.0.  See 
WalterAndrei.pdf from the 2007 conference.  Or watch the video (!).

--bb
Jul 17 2008
parent bobef <bobef nosmap-abv.bg> writes:
Grrr. Too bad things come down to Tango or D2, which is almost the choice to
use any D library at all or D2, since most of them use Tango. This is bad
situation.

Regards, bobef

Bill Baxter Wrote:


 bobef wrote:

 Jarrett Billingsley Wrote:
 

 "bobef" <bobef nosmap-abv.bg> wrote in message 
 news:g5o6c5$2is4$1 digitalmars.com...

 DMD 1.033:

 import tango.io.Stdout;

 void a(void delegate() dg)
 {
 dg();
 }

 void b(char[][] bb)
 {
 Stdout(bb);
 }

 void main(char[][] argv)
 {
 //why:
 {Stdout(argv);}.a(); //this is not working
 argv.b(); //and this is working?
 }



 not delegates. 



 Obviously. And why is that? If it is working for one primitive type I see no
reason it shouldn't work for the rest.



 It was originally just an unadvertised easter egg that it worked for any 
 type at all.  It was not in the spec at all for a long time, but I guess 
 since the experiment seemed to be a success, Walter decided to put it in.
 
 Making it work for all types is on the to-do list for D2.0.  See 
 WalterAndrei.pdf from the 2007 conference.  Or watch the video (!).
 
 --bb
Jul 18 2008
prev sibling parent reply bobef <bobef nosmap-abv.bg> writes:
Some more problems on this matter. This tries to invoke TST.ASD instead of .ASD
:

void ASD(char[] a,int b)
{
}

class TST
{
	this(){"asd".ASD(5);}
	void ASD(){}
}
Jul 22 2008
parent "Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"bobef" <bobef nosmap-abv.bg> wrote in message 
news:g64mei$1vu4$1 digitalmars.com...

 Some more problems on this matter. This tries to invoke TST.ASD instead of 
 .ASD :

 void ASD(char[] a,int b)
 {
 }

 class TST
 {
 this(){"asd".ASD(5);}
 void ASD(){}
 }



This is behaving correctly.  Remember that "asd".ASD(5) is just sugar for 
ASD("asd", 5).  Name lookup in D proceeds from the innermost scope, so the 
first ASD it finds, it tries to use.  It's exactly the same as when you try 
to do something like:

char[] toString()
{
    return toString(someMember) ~ ", " ~ toString(otherMember);
}

and the compiler complains about not using the right params to toString.
Jul 22 2008