Enum `c_void`

#[repr(u8)]
pub enum c_void

Equivalent to C's void type when used as a [pointer].

In essence, *const c_void is equivalent to C's const void* and *mut c_void is equivalent to C's void*. That said, this is not the same as C's void return type, which is Rust's () type.

To model pointers to opaque types in FFI, until extern type is stabilized, it is recommended to use a newtype wrapper around an empty byte array. See the Nomicon for details.

One could use std::os::raw::c_void if they want to support old Rust compilers down to 1.1.0. After Rust 1.30.0, it was re-exported by this definition. For more information, please read RFC 2521.

Variants

__variant1
__variant2

Trait Implementations

`impl Debug for c_void`

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Auto Trait Implementations

`impl Freeze for c_void`

`impl RefUnwindSafe for c_void`

`impl Send for c_void`

`impl Sync for c_void`

`impl Unpin for c_void`

`impl UnsafeUnpin for c_void`

`impl UnwindSafe for c_void`

Blanket Implementations

`impl<T> Any for c_void where T: 'static + ?Sized,`

fn type_id(&self) -> TypeId

`impl<T> Borrow<T> for c_void where T: ?Sized,`

fn borrow(&self) -> &T

`impl<T> BorrowMut<T> for c_void where T: ?Sized,`

fn borrow_mut(&mut self) -> &mut T

`impl<T> From<T> for c_void`

fn from(t: T) -> T: Returns the argument unchanged.

`impl<T> SizeHint for c_void where T: ?Sized,`

fn lower_bound(&self) -> usize
fn upper_bound(&self) -> Option<usize>

`impl<T> SizedTypeProperties for c_void`

`impl<T, U> Into for c_void where U: From<T>,`

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

`impl<T, U> TryFrom for c_void where U: Into<T>,`

type Error = never;
fn try_from(value: U) -> Result<T, never>

`impl<T, U> TryInto for c_void where U: TryFrom<T>,`

type Error = >::Error;
fn try_into(self) -> Result<U, >::Error>