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Add @interface decorator #239

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#315
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Add @interface decorator#239
#315

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@certik
certik
opened on Mar 15, 2022

Currently we define a function interface using:

def complex(x: f64, y: f64) -> c64:
    pass

But that is the same syntax as for an empty function. I think we should add an @interface decorator into ltypes, which would probably raise an exception if the function was ever being called (by CPython). In LPython, that would declare an interface, meaning the function with that name must be provided in global scope at some point before compiling to LLVM.

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  1. Smit-create commented on Apr 2, 2022

    @Smit-create
    Smit-create
    on Apr 2, 2022
    Collaborator

    Do you mean something like this?

    def interface():
    raise Exception('Unexpected to be called')

@interface
def complex(x: f64, y: f64) -> c64:
    pass

    Internally, we will handle lpython when it sees an interface operator, and CPython is not expected to call this function at all.

  2. certik commented on Apr 2, 2022

    @certik
    certik
    on Apr 2, 2022
    ContributorAuthor

    Yes, exactly. (The CPython implementation I think has to be a nested function though.)

  3. Smit-create commented on Apr 3, 2022

    @Smit-create
    Smit-create
    on Apr 3, 2022
    Collaborator

    Okay, I will try to get it implemented.

  4. certik
    closed this as completedin #315on Apr 4, 2022
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