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use crate::ptr::NullPtr;
use crate::{CppBox, CppDeletable, Ptr, Ref, StaticUpcast};
pub trait CastFrom<T>: Sized {
unsafe fn cast_from(value: T) -> Self;
}
pub trait CastInto<T>: Sized {
unsafe fn cast_into(self) -> T;
}
impl<T, U: CastFrom<T>> CastInto<U> for T {
unsafe fn cast_into(self) -> U {
U::cast_from(self)
}
}
impl<T, U> CastFrom<Ref<U>> for Ptr<T>
where
U: StaticUpcast<T>,
{
unsafe fn cast_from(value: Ref<U>) -> Self {
StaticUpcast::static_upcast(value.as_ptr())
}
}
impl<'a, T, U: CppDeletable> CastFrom<&'a CppBox<U>> for Ptr<T>
where
U: StaticUpcast<T>,
{
unsafe fn cast_from(value: &'a CppBox<U>) -> Self {
StaticUpcast::static_upcast(value.as_ptr())
}
}
impl<'a, T, U: CppDeletable> CastFrom<&'a CppBox<U>> for Ref<T>
where
U: StaticUpcast<T>,
{
unsafe fn cast_from(value: &'a CppBox<U>) -> Self {
StaticUpcast::static_upcast(value.as_ptr())
.as_ref()
.expect("StaticUpcast returned null on CppBox input")
}
}
impl<T, U> CastFrom<Ptr<U>> for Ptr<T>
where
U: StaticUpcast<T>,
{
unsafe fn cast_from(value: Ptr<U>) -> Self {
StaticUpcast::static_upcast(value)
}
}
impl<T, U> CastFrom<Ref<U>> for Ref<T>
where
U: StaticUpcast<T>,
{
unsafe fn cast_from(value: Ref<U>) -> Self {
StaticUpcast::static_upcast(value.as_ptr())
.as_ref()
.expect("StaticUpcast returned null on Ref input")
}
}
impl<T> CastFrom<NullPtr> for Ptr<T> {
unsafe fn cast_from(_value: NullPtr) -> Self {
Self::null()
}
}
impl<T, U> CastFrom<*const U> for Ptr<T>
where
U: StaticUpcast<T>,
{
unsafe fn cast_from(value: *const U) -> Self {
Self::cast_from(Ptr::from_raw(value))
}
}
impl<T, U> CastFrom<*mut U> for Ptr<T>
where
U: StaticUpcast<T>,
{
unsafe fn cast_from(value: *mut U) -> Self {
Self::cast_from(Ptr::from_raw(value))
}
}