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