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use super::*;
use core::ffi::c_void;
use core::marker::PhantomData;
use core::mem::transmute;
/// A borrowed type with the same memory layout as the type itself that can be used to construct ABI-compatible function signatures.
#[repr(transparent)]
pub struct Ref<'a, T: Type<T>>(T::Abi, PhantomData<&'a T>);
impl<'a, T: Type<T, Default = Option<T>, Abi = *mut c_void>> Ref<'a, T> {
/// Converts the argument to a [Result<&T>] reference.
pub fn ok(&self) -> Result<&T> {
if self.0.is_null() {
Err(Error::from_hresult(imp::E_POINTER))
} else {
unsafe { Ok(transmute::<&*mut c_void, &T>(&self.0)) }
}
}
}
impl<'a, T: Type<T>> core::ops::Deref for Ref<'a, T> {
type Target = T::Default;
fn deref(&self) -> &Self::Target {
unsafe { transmute(&self.0) }
}
}