xentropy Posts - Answer Overflow

xentropy

•Created by xentropy on 8/27/2024 in #questions

mojo-lsp-server crashing

Is it crashing for anybody else? I'm using it with neovim and I can reliably make it crash after a couple of minutes of using it.

35 replies

MModular

•Created by xentropy on 8/9/2024 in #questions

Is this broken or is it me? Parameterized function alias...

alias ExampleFn = fn [L: Int] (Int32) -> SIMD[DType.uint8, L];

fn example_fn_1 [L: Int] (default: Int32) -> SIMD[DType.uint8, L]:
    return SIMD[DType.uint8, L](default);


struct ExampleStruct:
    var example_fn: ExampleFn;

    fn __init__(inout self):
        self.example_fn = example_fn_1;

    """  This works fine """
    fn make_buffer_ok [L: Int] (inout self, default: Int32) -> SIMD[DType.uint8, L]:
        return example_fn_1[L](default);

    """  This does not work """
    fn make_buffer_sad [L: Int] (inout self, default: Int32) -> SIMD[DType.uint8, L]:
        return self.example_fn[L](default);

alias ExampleFn = fn [L: Int] (Int32) -> SIMD[DType.uint8, L];

fn example_fn_1 [L: Int] (default: Int32) -> SIMD[DType.uint8, L]:
    return SIMD[DType.uint8, L](default);


struct ExampleStruct:
    var example_fn: ExampleFn;

    fn __init__(inout self):
        self.example_fn = example_fn_1;

    """  This works fine """
    fn make_buffer_ok [L: Int] (inout self, default: Int32) -> SIMD[DType.uint8, L]:
        return example_fn_1[L](default);

    """  This does not work """
    fn make_buffer_sad [L: Int] (inout self, default: Int32) -> SIMD[DType.uint8, L]:
        return self.example_fn[L](default);

The error is:

/home/pi/Development/mojo-lgpio/test.mojo:20:31: error: 'fn[Int](SIMD[int32, 1]) -> SIMD[uint8, $0]' is not subscriptable, it does not implement the `__getitem__`/`__setitem__` or `__refitem__` methods
        return self.example_fn[L](default);

/home/pi/Development/mojo-lgpio/test.mojo:20:31: error: 'fn[Int](SIMD[int32, 1]) -> SIMD[uint8, $0]' is not subscriptable, it does not implement the `__getitem__`/`__setitem__` or `__refitem__` methods
        return self.example_fn[L](default);

Basically, I need to use pattern of make_buffer_sad because I am using FFI to write a wrapper around lgpio...

15 replies

MModular

•Created by xentropy on 8/3/2024 in #questions

Interfaces or Abstract Classes

I am learning the language, coming from .NET and Python. I am trying to implement a feature that is only aware of the of signature of another feature, and isn't concerned with its implementation details. Naturally, I reached for the traits system, but hit a brick wall because I found out you can't specify the return type of a function to be a trait, and I don't think you can specify a variable's type to be a trait either. I got partly around this writing a function that takes in the trait... I'm probably not making a ton of sense. Suppose I have feature A, that I want to be swappable at runtime with feature B based on a runtime configuration. Traditionally I would do this with interfaces, and traits seem like the closest thing. Is there a way to do this in Mojo?

7 replies

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