On Sun, 11 Jan 2009 10:08:47 +0300, Tim M <a...@b.com> wrote:
On Sun, 11 Jan 2009 19:56:55 +1300, Denis Koroskin <2kor...@gmail.com>
wrote:
On Sun, 11 Jan 2009 06:04:01 +0300, Tim M <a...@b.com> wrote:
On Sun, 11 Jan 2009 15:59:26 +1300, Tim M <a...@b.com> wrote:
On Sun, 11 Jan 2009 15:50:54 +1300, Daniel Keep
<daniel.keep.li...@gmail.com> wrote:
Tim M wrote:
Why is this an error. Dmd wants to make sure that I declare a new
variable in the foreach statement and not use an existing one?
module test;
void main()
{
int i;
int[] nums;
foreach(i; nums)
{
//
}
}
dmd test.d
test.d(7): Error: shadowing declaration test.main.i is deprecated
Yes; as the error states, you're not allowed to define variables
with the same name as variables in an enclosing scope any more.
-- Daniel
Why does it still work for some objects?
This works:
module test;
class A
{
this()
{
//
}
}
class B
{
this()
{
//
}
int opApply (int delegate (inout B) dg)
{
return 1;
}
}
void main()
{
A a;
B b;
foreach(a; b)
{
//
}
}
It is a bug and should be reported.
Yep that probibly is a slight bug. What I would like to know is why cant
I do foreach with primitive types like I can with objects.
You can use foreach to iterate over arrays and tuples, if that's what you mean.
Iterating over over primitive types makes little sense.
The objects
use an existing variable but an int would require a new int defined with
the foreach params.
You got it wrong, foreach never use an existing variable. Try yourself:
void main()
{
B b;
foreach (a; b)
{
}
}
Variable shadowing is disallowed for this very reason - to avoid "what variable do I
use here" type of confusion.
The code you provided is incorrect, but compiler currently accepts it (which is a bug).
You should remove "A a;" from the main, it is never used anyway.
