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use crate::slice::CSliceMut;
use crate::trait_group::c_void;
use crate::trait_group::*;
use core::ops::{Deref, DerefMut};
use std::boxed::Box;
#[repr(C)]
#[cfg_attr(feature = "abi_stable", derive(::abi_stable::StableAbi))]
pub struct CBox<'a, T: 'a> {
instance: &'a mut T,
drop_fn: Option<unsafe extern "C" fn(&mut T)>,
}
impl<T> super::trait_group::IntoInner for CBox<'_, T> {
type InnerTarget = T;
unsafe fn into_inner(self) -> Self::InnerTarget {
let b = Box::from_raw(self.instance);
std::mem::forget(self);
*b
}
}
impl<T> Deref for CBox<'_, T> {
type Target = T;
fn deref(&self) -> &Self::Target {
self.instance
}
}
impl<T> DerefMut for CBox<'_, T> {
fn deref_mut(&mut self) -> &mut Self::Target {
self.instance
}
}
impl<T> From<Box<T>> for CBox<'_, T> {
fn from(this: Box<T>) -> Self {
let instance = Box::leak(this);
Self {
instance,
drop_fn: Some(cglue_drop_box::<T>),
}
}
}
impl<T> From<T> for CBox<'_, T> {
fn from(this: T) -> Self {
let b = Box::new(this);
CBox::from(b)
}
}
impl<T> From<(T, NoContext)> for CBox<'_, T> {
fn from((this, _): (T, NoContext)) -> Self {
let b = Box::new(this);
CBox::from(b)
}
}
impl<T> Drop for CBox<'_, T> {
fn drop(&mut self) {
if let Some(drop_fn) = self.drop_fn.take() {
unsafe { drop_fn(self.instance) };
}
}
}
unsafe impl<'a, T> Opaquable for CBox<'a, T> {
type OpaqueTarget = CBox<'a, c_void>;
}
unsafe extern "C" fn cglue_drop_box<T>(this: &mut T) {
let _ = Box::from_raw(this);
}
#[repr(C)]
#[cfg_attr(feature = "abi_stable", derive(::abi_stable::StableAbi))]
pub struct CSliceBox<'a, T: 'a> {
instance: CSliceMut<'a, T>,
drop_fn: Option<unsafe extern "C" fn(&mut CSliceMut<'a, T>)>,
}
impl<T> Deref for CSliceBox<'_, T> {
type Target = [T];
fn deref(&self) -> &Self::Target {
&self.instance
}
}
impl<T> DerefMut for CSliceBox<'_, T> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.instance
}
}
impl<T> From<Box<[T]>> for CSliceBox<'_, T> {
fn from(this: Box<[T]>) -> Self {
let instance = Box::leak(this).into();
Self {
instance,
drop_fn: Some(cglue_drop_slice_box::<T>),
}
}
}
impl<T> Drop for CSliceBox<'_, T> {
fn drop(&mut self) {
if let Some(drop_fn) = self.drop_fn.take() {
unsafe { drop_fn(&mut self.instance) };
}
}
}
unsafe impl<'a, T> Opaquable for CSliceBox<'a, T> {
type OpaqueTarget = CSliceBox<'a, c_void>;
}
unsafe extern "C" fn cglue_drop_slice_box<'a, T>(this: &mut CSliceMut<'a, T>) {
let extended_instance = (this as *mut CSliceMut<_>).as_mut().unwrap();
let _ = Box::from_raw(extended_instance.as_slice_mut());
}