40 lines
1.4 KiB
Rust
40 lines
1.4 KiB
Rust
use super::*;
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use core::marker::PhantomData;
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/// A type representing an agile reference to a COM/WinRT object.
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#[repr(transparent)]
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#[derive(Clone, PartialEq, Eq)]
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pub struct AgileReference<T>(imp::IAgileReference, PhantomData<T>);
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impl<T: Interface> AgileReference<T> {
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/// Creates an agile reference to the object.
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pub fn new(object: &T) -> Result<Self> {
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// TODO: this assert is required until we can catch this at compile time using an "associated const equality" constraint.
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// For example, <T: Interface<UNKNOWN = true>>
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// https://github.com/rust-lang/rust/issues/92827
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assert!(T::UNKNOWN);
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unsafe {
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imp::RoGetAgileReference(
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imp::AGILEREFERENCE_DEFAULT,
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&T::IID,
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core::mem::transmute::<&T, &IUnknown>(object),
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)
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.map(|reference| Self(reference, Default::default()))
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}
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}
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/// Retrieves a proxy to the target of the `AgileReference` object that may safely be used within any thread context in which get is called.
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pub fn resolve(&self) -> Result<T> {
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unsafe { self.0.Resolve() }
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}
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}
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unsafe impl<T: Interface> Send for AgileReference<T> {}
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unsafe impl<T: Interface> Sync for AgileReference<T> {}
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impl<T> core::fmt::Debug for AgileReference<T> {
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fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
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write!(f, "AgileReference({:?})", &self.0)
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}
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}
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