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use std::error::Error;
use std::marker::PhantomData;
use super::null_ptr_error;
use super::{FromForeign, InputType};
pub struct BoxRefMarshaler<T>(PhantomData<T>);
impl<T> InputType for BoxRefMarshaler<T> {
type Foreign = *mut T;
type ForeignTraitObject = ();
}
impl<'a, T> FromForeign<*mut T, &'a T> for BoxRefMarshaler<T> {
type Error = Box<dyn Error>;
#[inline(always)]
unsafe fn from_foreign(foreign: *mut T) -> Result<&'a T, Self::Error> {
log::debug!(
"<BoxMarshaler<{ty}> as FromForeign<*mut Box<T>, &'a mut Box<T>>>::from_foreign({:?})",
foreign,
ty = std::any::type_name::<T>()
);
if foreign.is_null() {
return Err(null_ptr_error());
}
Ok(&*foreign)
}
}