Can't import VKCells into PDK repo

[josepfargas]

When trying to import an euler bend in a PDK repo, if I use the virtual version I get an error

This is fine bend = kf.cells.euler.bend_euler_factory(pdk)(width=1, radius=10, angle=15, layer=pdk.infos.MYLAYER)

This gives an error: e_bend = kf.cells.virtual.euler.virtual_bend_euler(pdk)(width=1, radius=10, angle=15, layer=pdk.infos.MYLAYER) TypeError: unhashable type: 'MY_PDK'

Is this a bug, or am I doing something wrong?

Thanks

[sebastian-goeldi]

You need to use the factories for this. Tje cells are registered to the default KCLayout, i.e. kf.kcl. The factories allow you to register default functions to arbitrary KCLayouts/PDK. Also important, you need to make sure you only register it once, if you do it twice, you will have a cache miss and it will create a duplicate cell.

So, do:

/path/to/pdk/my_submodule_for_virtuals.py

```python bend_euler_virtual = kf.factories.virtual.bend_euler_factory(MYPDK) ```

/path/to/pdk/other_submodule.py

```python # this of course also works if this is not in the pdk # In that case just use `from pdk.my_submoduo_for_virtuals import bend_euler_virtual` from .. import bend_euler_virtual @MYPDK.cell def cell_with_virtual(...) -> kf.KCell: c = MYPDK.kcell() # ... bend = c << bendeuler_virtual(width=1, radius=10, angle=15, layer=pdk.infos.MYLAYER) ```

The problem in your case is that you pass the pdk where kfactory expects the first argument of the cell function. But it gets shadowed because KCLayout is not hashable. I think I can kind of fix that by makung it hashable through the name. But I need to think first whether that is a good idea or not.

[josepfargas]

Sorry, just got to this, It seems that creating the factory first bend_euler_virtual = kf.factories.virtual.bend_euler_factory(MYPDK) creates the same error as before TypeError: unhashable type: 'MY_PDK'

[josepfargas]

s_bend = c.create_vinst(kf.cells.euler.bend_euler_factory(MYPDK)(width=1, radius=10, angle=15, layer=pdk.infos.MYLAYER,)) This worked tho.