Vendor dependencies for 0.3.0 release

vendor/windows-core-0.58.0/src/ref.rs

@@ -0,0 +1,26 @@
+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) }
+    }
+}