NamedGeneric

class discopy.interaction.NamedGeneric

Bases: Generic[T]

A NamedGeneric is a Generic where the type parameter has a name.

Parameters:

attr – The name of the type parameter.

Note

In a standard Generic class, the type parameter disappears when the member of the class is instantiated, e.g.

>>> assert list[int]([1, 2, 3])\
...     == list[float]([1, 2, 3])\
...     == [1, 2, 3]

In a NamedGeneric, the type parameter is attached to the members of the class so that we have access to it.

Example

>>> from dataclasses import dataclass
>>> @dataclass
... class L(NamedGeneric["dtype"]):
...     inside: list
>>> assert L[int]([1, 2, 3]).dtype == int
>>> assert L[int]([1, 2, 3]) != L[float]([1, 2, 3])