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Add v8::Value::InstanceOf bindings #879

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merged 11 commits into from
Feb 11, 2022

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littledivy
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@piscisaureus
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I am not in favor of implementing deref_mut for Local handles.

@littledivy littledivy marked this pull request as ready for review January 23, 2022 10:59
src/handle.rs Outdated
Comment on lines 115 to 119
impl<'s, T> DerefMut for Local<'s, T> {
fn deref_mut(&mut self) -> &mut T {
unsafe { self.0.as_mut() }
}
}
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As per @piscisaureus's comment we should remove this

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instance_of requires for T to be mutable in v8::Local<T>, hence the deref_mut implementation. I'm not sure how you can do instance_of on a local handle without this.

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Is there a reason the InstanceOf function is not marked as const in the c++ api?
Seems counter-intuitive, could this be a mistake in the v8 c++ api?

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@piscisaureus please advise

@aapoalas
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aapoalas commented Feb 9, 2022

I may well be wrong, but it seems like this binding will be necessary for implementing magic (de)serialiser for FFI-related custom class wrapping ArrayBuffers for passing to native libraries.

@piscisaureus
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Discussed offline with @littledivy.

  • We will remove the DerefMut impl for Local handles.
  • Method signature will be:
    fn instance_of<'s>(&self, scope: &mut HandleScope<'s>, object: Local<Object>) -> Option<bool>;

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LGTM

@littledivy littledivy merged commit 0f34359 into denoland:main Feb 11, 2022
@littledivy littledivy deleted the instance_of_value branch February 11, 2022 02:58
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6 participants