Use numba on classes?

Question

I can found in 0.6 numba documentation some informations about how to use numba on classes:

from numba import jit, void, int_, double

# All methods must be given signatures

@jit
class Shrubbery(object):
    @void(int_, int_)
    def __init__(self, w, h):
        # All instance attributes must be defined in the initializer
        self.width = w
        self.height = h

        # Types can be explicitly specified through casts
        self.some_attr = double(1.0)

    @int_()
    def area(self):
        return self.width * self.height

    @void()
    def describe(self):
        print("This shrubbery is ", self.width,
              "by", self.height, "cubits.")

But i don't found in 0.16 documentation. Is it always possible to use numba on classes ?

Answer 1

As of version 0.23 there is a numba.jitclass method. I can say that the following works in version 0.26

@numba.jitclass([('width', numba.float64), ('height', numba.float64)])
class Shrubbery(object):
    def __init__(self, w, h):
        self.width = w
        self.height = h

    def area(self):
        return self.width * self.height

shrubbery = Shrubbery(10, 20)
print(shrubbery.area())

The documentation says that only methods and properties are allowed, so including the describe function will unfortunately not work at the moment.