Re: an error I don't understand
Hi Brad,
I don't know why you are getting an error.
But I think that this is one case where you should be writing `BUILD`
instead of `TWEAK`.
Note though that you can only have one `BUILD` or `TWEAK` per class.
A quick test showed to me that it doesn't matter if I use BUILD or
TWEAK. Besides this, I tried this construct before without the TWEAK or
BUILD submethods and the assignment generated the same errors.
To answer your question below I just want to have an assignment to
another typed variable which works for all variables but not the CStruct
variable. Like below;
my cairo_path_data_point_t $p1 = $another-path-data-point;
I must also mention that it becomes awkward when such a variable is
provided as an argument to some method. Binding will generate also such
message.
In the mean time I made a small program which didn't generate errors,
see below
---
use v6;
use NativeCall;
class cairo_path_data_point_t is repr('CStruct') is export {
has num64 $.x;
has num64 $.y;
}
my cairo_path_data_point_t $d1 .= new( :x(1e0), :y(2e0));
my cairo_path_data_point_t $d2 = $d1;
note "d2: ", $d2.perl; # d2: cairo_path_data_point_t.new(x =>
1e0, y => 2e0)
---
and this is what I want I now need a Crystal Ball to find me the
answer of the problems I ran into :-\
Well, at least the error is weird to warn me that I cannot assign a
variable to another of the same type.
Regards,
Marcel
---
Or maybe you want a multi method `new` instead?
multi method new ( :$native-object! ) {
samewith( x => $native-object.x, y => $native-object.y )
}
Assuming that `x` and `y` are actually public attributes you could
pull them out of the object in the signature.
multi method new ( :$native-object! (:$x, :$y) ) {
samewith( :$x, :$y )
}
If you need to throw out other public attributes, add `*%`
multi method new ( :$native-object! (:$x, :$y, *%) ) {
samewith( :$x, :$y )
}
---
Honestly I do not understand why you are passing in an already
constructed object, and I don't know anything about it either.
If you gave us answers for those two questions, we may be able to help
you better.
On Sat, Jun 27, 2020 at 10:56 AM Marcel Timmerman > wrote:
Hi,
I am getting an error and don't know why it happens, it might even
be a
bug. It is about an assignment to a CStruct variable.
The structure is defined like;
class cairo_path_data_point_t is repr('CStruct') is export {
has num64 $.x;
has num64 $.y;
submethod TWEAK ( :$native-object ) {
$!x = $native-object.x;
$!y = $native-object.y;
}
}
The error is generated when typed variables are used (below, $x is
also
a cairo_path_data_point_t);
my cairo_path_data_point_t $p1 = $x;
or
my cairo_path_data_point_t $p1 =
cairo_path_data_point_t.new(:native-object($x));
but not with
my cairo_path_data_point_t $p1 .= new(:native-object($x));
or
my $p1 = $x;
After which all fields in the structure are happely accessable
using $p1!
The error is
Type check failed in assignment to $p1; expected
cairo_path_data_point_t
but got cairo_path_data_point_t.new(x => 0e0, y => 0e0)
Raku version: 2020.06-7-gf1960baa9 built on MoarVM version
2020.06-6-gbf6af07de
implementing Raku 6.d.
The content of the structure does not matter, I've seen it with other
structures too.
Regards,
Marcel
Re: an error I don't understand
I don't know why you are getting an error.
But I think that this is one case where you should be writing `BUILD`
instead of `TWEAK`.
Note though that you can only have one `BUILD` or `TWEAK` per class.
---
Or maybe you want a multi method `new` instead?
multi method new ( :$native-object! ) {
samewith( x => $native-object.x, y => $native-object.y )
}
Assuming that `x` and `y` are actually public attributes you could pull
them out of the object in the signature.
multi method new ( :$native-object! (:$x, :$y) ) {
samewith( :$x, :$y )
}
If you need to throw out other public attributes, add `*%`
multi method new ( :$native-object! (:$x, :$y, *%) ) {
samewith( :$x, :$y )
}
---
Honestly I do not understand why you are passing in an already constructed
object, and I don't know anything about it either.
If you gave us answers for those two questions, we may be able to help you
better.
On Sat, Jun 27, 2020 at 10:56 AM Marcel Timmerman wrote:
> Hi,
>
> I am getting an error and don't know why it happens, it might even be a
> bug. It is about an assignment to a CStruct variable.
>
> The structure is defined like;
>
> class cairo_path_data_point_t is repr('CStruct') is export {
>has num64 $.x;
>has num64 $.y;
>
>submethod TWEAK ( :$native-object ) {
> $!x = $native-object.x;
> $!y = $native-object.y;
>}
> }
>
>
> The error is generated when typed variables are used (below, $x is also
> a cairo_path_data_point_t);
>
> my cairo_path_data_point_t $p1 = $x;
>
> or
>
> my cairo_path_data_point_t $p1 =
> cairo_path_data_point_t.new(:native-object($x));
>
> but not with
>
> my cairo_path_data_point_t $p1 .= new(:native-object($x));
>
> or
>
> my $p1 = $x;
>
> After which all fields in the structure are happely accessable using $p1!
>
>
> The error is
>
> Type check failed in assignment to $p1; expected cairo_path_data_point_t
> but got cairo_path_data_point_t.new(x => 0e0, y => 0e0)
>
>
> Raku version: 2020.06-7-gf1960baa9 built on MoarVM version
> 2020.06-6-gbf6af07de
> implementing Raku 6.d.
>
> The content of the structure does not matter, I've seen it with other
> structures too.
>
> Regards,
> Marcel
>
an error I don't understand
Hi,
I am getting an error and don't know why it happens, it might even be a
bug. It is about an assignment to a CStruct variable.
The structure is defined like;
class cairo_path_data_point_t is repr('CStruct') is export {
has num64 $.x;
has num64 $.y;
submethod TWEAK ( :$native-object ) {
$!x = $native-object.x;
$!y = $native-object.y;
}
}
The error is generated when typed variables are used (below, $x is also
a cairo_path_data_point_t);
my cairo_path_data_point_t $p1 = $x;
or
my cairo_path_data_point_t $p1 =
cairo_path_data_point_t.new(:native-object($x));
but not with
my cairo_path_data_point_t $p1 .= new(:native-object($x));
or
my $p1 = $x;
After which all fields in the structure are happely accessable using $p1!
The error is
Type check failed in assignment to $p1; expected cairo_path_data_point_t
but got cairo_path_data_point_t.new(x => 0e0, y => 0e0)
Raku version: 2020.06-7-gf1960baa9 built on MoarVM version
2020.06-6-gbf6af07de
implementing Raku 6.d.
The content of the structure does not matter, I've seen it with other
structures too.
Regards,
Marcel
