Implement inheritance

[tanay-man]

Example :

from lpython import i32

class Base:
    def __init__(self:"Base"):
        self.x_A : i32 = 10

class Derived(Base):
    def __init__(self:"Derived") :
        super().__init__()
        self.y_B : i32 = 6
    def get_x_A(self:"Derived"):
        print(self.x_A)
def main():
    d : Derived = Derived()
    print(d.x_A)
    print(d.y_B)
    d.get_x_A()
main()

[tanay-man]

Can we create a var super and add it to the symtab of the derived class?

super : Base = Base()

So we can search the symtab of the derived and if the member / member fn is not found , we can move to the symtab of the super. Reference - https://docs.python.org/3/library/functions.html#super

[Thirumalai-Shaktivel]

@certik, What do you think the best approach here?

[certik]

super() in Python is a function. Is the idea to add this function as a method to a class? In Python it's not a method, but a global intrinsic function. Or is the idea to add a super variable? That also seems would differ from CPython.

I would handle super() in the frontend only, and in ASR we need some mechanism to call methods of the parent class. I think you can just call any method directly from the parent symtab, cannot you?

So it seems it's not needed to put super into the symbol table in any form?

[tanay-man]

Ok got it 👍🏻

[tanay-man]

Should the members and member functions of the base class be added to the derived class' symtab, or should they be added as an external symbol? @certik @Thirumalai-Shaktivel