scuffle-ffmpeg 0.0.1

FFmpeg bindings for Rust.
Documentation 
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#[derive(Debug)]
pub struct SmartPtr<T>(SmartObject<*mut T>);

#[derive(Debug)]
pub(crate) struct SmartObject<T> {
	value: Option<T>,
	destructor: fn(&mut T),
}

impl<T> SmartObject<T> {
	pub(crate) fn new(value: T, destructor: fn(&mut T)) -> Self {
		Self {
			value: Some(value),
			destructor,
		}
	}

	pub(crate) fn set_destructor(&mut self, destructor: fn(&mut T)) {
		self.destructor = destructor;
	}

	pub(crate) fn into_inner(mut self) -> T {
		self.value.take().unwrap()
	}

	fn inner(&self) -> T
	where
		T: Copy,
	{
		self.value.unwrap()
	}

	fn mut_inner(&mut self) -> &mut T {
		self.value.as_mut().unwrap()
	}
}

impl<T> std::ops::Deref for SmartObject<T> {
	type Target = T;

	fn deref(&self) -> &Self::Target {
		self.value.as_ref().unwrap()
	}
}

impl<T> std::ops::DerefMut for SmartObject<T> {
	fn deref_mut(&mut self) -> &mut Self::Target {
		self.value.as_mut().unwrap()
	}
}

impl<T> Drop for SmartObject<T> {
	fn drop(&mut self) {
		if let Some(mut value) = self.value.take() {
			(self.destructor)(&mut value);
		}
	}
}

impl<T> AsRef<T> for SmartObject<T> {
	fn as_ref(&self) -> &T {
		self.value.as_ref().unwrap()
	}
}

impl<T> AsMut<T> for SmartObject<T> {
	fn as_mut(&mut self) -> &mut T {
		self.value.as_mut().unwrap()
	}
}

impl<T> SmartPtr<T> {
	/// Safety: The pointer must be valid.
	pub unsafe fn wrap(ptr: *mut T, destructor: fn(&mut *mut T)) -> Self {
		Self(SmartObject::new(ptr, destructor))
	}

	/// Safety: The pointer must be valid.
	pub unsafe fn wrap_non_null(ptr: *mut T, destructor: fn(&mut *mut T)) -> Option<Self> {
		if ptr.is_null() {
			None
		} else {
			Some(Self::wrap(ptr, destructor))
		}
	}

	pub(crate) fn set_destructor(&mut self, destructor: fn(&mut *mut T)) {
		self.0.set_destructor(destructor);
	}

	pub(crate) fn into_inner(self) -> *mut T {
		self.0.into_inner()
	}

	pub(crate) fn as_deref(&self) -> Option<&T> {
		// Safety: The pointer is valid.
		unsafe { self.0.inner().as_ref() }
	}

	pub(crate) fn as_deref_mut(&mut self) -> Option<&mut T> {
		// Safety: The pointer is valid.
		unsafe { self.0.inner().as_mut() }
	}

	/// Panics if the pointer is null.
	pub(crate) fn as_deref_except(&self) -> &T {
		self.as_deref().expect("deref is null")
	}

	/// Panics if the pointer is null.
	pub(crate) fn as_deref_mut_except(&mut self) -> &mut T {
		self.as_deref_mut().expect("deref is null")
	}

	pub(crate) fn as_ptr(&self) -> *const T {
		self.0.inner()
	}

	pub(crate) fn as_mut_ptr(&mut self) -> *mut T {
		self.0.inner()
	}

	pub(crate) fn as_mut(&mut self) -> &mut *mut T {
		self.0.mut_inner()
	}
}