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use super::*;
/// A borrowed type with the same memory layout as the type itself that can be used to construct ABI-compatible function signatures.
///
/// This is a mutable version of [Ref] meant to support out parameters.
#[repr(transparent)]
pub struct OutRef<'a, T: Type<T>>(*mut T::Abi, core::marker::PhantomData<&'a T>);
impl<'a, T: Type<T>> OutRef<'a, T> {
/// Returns `true` if the argument is null.
pub fn is_null(&self) -> bool {
self.0.is_null()
}
/// Overwrites a memory location with the given value without reading or dropping the old value.
pub fn write(self, value: T::Default) -> Result<()> {
if self.0.is_null() {
Err(Error::from_hresult(imp::E_POINTER))
} else {
unsafe { *self.0 = core::mem::transmute_copy(&value) }
core::mem::forget(value);
Ok(())
}
}
}