• bearophile <bearophileHUGS lycos.com> Jul 01 2011
• Don <nospam nospam.com> Jul 05 2011
• bearophile <bearophileHUGS lycos.com> Jul 06 2011
• Wilfried Kirschenmann <wilfried.kirschenmann gmail.com> Jul 17 2011
• bearophile <bearophileHUGS lycos.com> Jul 18 2011
• Andrej Mitrovic <andrej.mitrovich gmail.com> Jul 18 2011

bearophile <bearophileHUGS lycos.com> writes:

Currently this is not allowed, but do you desire a feature like this?


struct Foo {
    int x, y;
    int[100] array;
}
void main() {
    auto foos = new Foo[100];
    foos[].y += 10; // ***
}

Bye,
bearophile

Don <nospam nospam.com> writes:

bearophile wrote:
 Currently this is not allowed, but do you desire a feature like this?
 
 
 struct Foo {
     int x, y;
     int[100] array;
 }
 void main() {
     auto foos = new Foo[100];
     foos[].y += 10; // ***
 }
 
 Bye,
 bearophile


An interesting use case:

void main()
{
    cdouble[100] foos;
    foos[].re = 5.0;
}

bearophile <bearophileHUGS lycos.com> writes:

Don:

 An interesting use case:
 
 void main()
 {
     cdouble[100] foos;
     foos[].re = 5.0;
 }


I don't often have to update arrays of complex numbers, more often I have to
set or update a single field of an array of structs.

Bye,
bearophile

Wilfried Kirschenmann <wilfried.kirschenmann gmail.com> writes:

On Sat, Jul 2, 2011 at 04:12, bearophile <bearophileHUGS lycos.com> wrote:
 Currently this is not allowed, but do you desire a feature like this?


 struct Foo {
 =C2=A0 =C2=A0int x, y;
 =C2=A0 =C2=A0int[100] array;
 }
 void main() {
 =C2=A0 =C2=A0auto foos =3D new Foo[100];
 =C2=A0 =C2=A0foos[].y +=3D 10; // ***
 }


In fact, I would be more interested in the opposite :
void main() {
  auto foos =3D new Foo[100];
  auto ints =3D new int[100]
  ints =3D foos[].y;
}

This would simplify the wrinting of numerous application, especially
in the writing of image/video processing (eg. rgb2yuv conversions)
This would also simplify the writing of template library transforming
"array of struct" to "struct of arrays" in a transparent manner for
the library user.

Wilfried

bearophile <bearophileHUGS lycos.com> writes:

Wilfried Kirschenmann:

 In fact, I would be more interested in the opposite :


If you allow that syntax on the left you probably allow it on the right too.

Bye,
bearophile

Andrej Mitrovic <andrej.mitrovich gmail.com> writes:

float[] buffers = malloc..;
float*[] CBuffers = buffers[].ptr;

Pure win.