I've tried to use a delegate as aggregate in foreach:

void main()
{
	auto dg = delegate(inout int i)
		{
			static int j;
			if (j > 1000) return 1;
			i = j++;
			return 0;
		};

	foreach (int i; dg)
	{
		writefln(i);
	}
}

The code gives the error:

test.d(15): cannot implicitly convert expression (__foreachbody2) of
type int delegate(inout int i) to int

test.d(15): cast(int)__foreachbody2 is not an lvalue

What am I doing wrong?

Max Samuha escribió:
> I've tried to use a delegate as aggregate in foreach:
> 
> void main()
> {
> 	auto dg = delegate(inout int i)
> 		{
> 			static int j;
> 			if (j > 1000) return 1;
> 			i = j++;
> 			return 0;
> 		};
> 
> 	foreach (int i; dg)
> 	{
> 		writefln(i);
> 	}
> }
> 
> The code gives the error:
> 
> test.d(15): cannot implicitly convert expression (__foreachbody2) of
> type int delegate(inout int i) to int
> 
> test.d(15): cast(int)__foreachbody2 is not an lvalue
> 
> What am I doing wrong?

I can't try it (Mac OS X here), but maybe your foreach should be:
foreach (inout int i; dg)
Just a guess.

-- 
Carlos Santander Bernal

Max Samuha wrote:
> I've tried to use a delegate as aggregate in foreach:
> 
> void main()
> {
> 	auto dg = delegate(inout int i)
> 		{
> 			static int j;
> 			if (j > 1000) return 1;
> 			i = j++;
> 			return 0;
> 		};
> 
> 	foreach (int i; dg)
> 	{
> 		writefln(i);
> 	}
> }
> 
> The code gives the error:
> 
> test.d(15): cannot implicitly convert expression (__foreachbody2) of
> type int delegate(inout int i) to int
> 
> test.d(15): cast(int)__foreachbody2 is not an lvalue
> 
> What am I doing wrong?

I think that the problem is that 'dg' should be of type 'int delegate(int delegate(inout int))'.

Max Samuha wrote:

> What am I doing wrong?

Semms you mean something like this:

import std.stdio;

void main()
{
        auto dg = delegate (int delegate( inout int) dgp)
		{
                        static int j=0;
                        int res=0;
                        while( j < 15){
                                j++;
                                res= dgp(j);
                                if(res) break;
                        }
			        return res;
		};

	foreach (int i; dg)
	{
		writefln(i);
	}
}

On Tue, 17 Oct 2006 23:57:46 +0000 (UTC), Karen Lanrap
<karen@digitaldaemon.com> wrote:

>Max Samuha wrote:
>
>> What am I doing wrong?
>
>Semms you mean something like this:
>
>import std.stdio;
>
>void main()
>{
>        auto dg = delegate (int delegate( inout int) dgp)
>		{
>                        static int j=0;
>                        int res=0;
>                        while( j < 15){
>                                j++;
>                                res= dgp(j);
>                                if(res) break;
>                        }
>			        return res;
>		};
>
>	foreach (int i; dg)
>	{
>		writefln(i);
>	}
>}

Yes, right. Thanks a lot