Enum devela::_std::ffi::c_void

1.30.0 · source ·
#[repr(u8)]
pub enum c_void { // some variants omitted }
Expand description

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 compiler down to 1.1.0. After Rust 1.30.0, it was re-exported by this definition. For more information, please read RFC 2521.

Trait Implementations§

1.16.0 · source§

impl Debug for c_void

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Also for T

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fn also_mut<F: FnOnce(&mut Self)>(self, f: F) -> Self

Available on crate feature result only.
Applies a function which takes the parameter by exclusive reference, and then returns the (possibly) modified owned value. Read more
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fn also_ref<F: FnOnce(&Self)>(self, f: F) -> Self

Available on crate feature result only.
Applies a function which takes the parameter by shared reference, and then returns the (possibly) modified owned value. Read more
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> AnyExt for T
where T: Any,

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fn type_of(&self) -> TypeId

Available on crate feature any only.
Returns the TypeId of self. Read more
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fn type_name(&self) -> &'static str

Available on crate feature any only.
Returns the type name of self. Read more
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fn type_is<T: 'static>(&self) -> bool

Available on crate feature any only.
Returns true if Self is of type T. Read more
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fn as_any_ref(&self) -> &dyn Any
where Self: Sized,

Available on crate feature any only.
Upcasts &self as &dyn Any. Read more
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fn as_any_mut(&mut self) -> &mut dyn Any
where Self: Sized,

Available on crate feature any only.
Upcasts &mut self as &mut dyn Any. Read more
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fn as_any_box(self: Box<Self>) -> Box<dyn Any>
where Self: Sized,

Available on crate feature any only.
Upcasts Box<self> as Box<dyn Any>. Read more
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impl<T, Res> Apply<Res> for T
where T: ?Sized,

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fn apply<F: FnOnce(Self) -> Res>(self, f: F) -> Res
where Self: Sized,

Available on crate feature result only.
Apply a function which takes the parameter by value.
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fn apply_ref<F: FnOnce(&Self) -> Res>(&self, f: F) -> Res

Available on crate feature result only.
Apply a function which takes the parameter by shared reference.
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fn apply_mut<F: FnOnce(&mut Self) -> Res>(&mut self, f: F) -> Res

Available on crate feature result only.
Apply a function which takes the parameter by exclusive reference.
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> Mem for T
where T: ?Sized,

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const NEEDS_DROP: bool = _

Available on crate feature mem only.
Whether dropping values of this type matters.
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fn mem_needs_drop(&self) -> bool

Available on crate feature mem only.
Returns true if dropping values of this type matters.
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fn mem_drop(self)
where Self: Sized,

Available on crate feature mem only.
Drops self by running its destructor.
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fn mem_forget(self)
where Self: Sized,

Available on crate feature mem only.
Forgets about self without running its destructor.
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fn mem_replace(&mut self, other: Self) -> Self
where Self: Sized,

Available on crate feature mem only.
Replaces self with other, returning the previous value of self.
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fn mem_take(&mut self) -> Self
where Self: Default,

Available on crate feature mem only.
Replaces self with its default value, returning the previous value of self.
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fn mem_swap(&mut self, other: &mut Self)
where Self: Sized,

Available on crate feature mem only.
Swaps the value of self and other without deinitializing either one.
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fn mem_as_bytes(&self) -> &[u8]
where Self: Sync + Unpin,

Available on crate features mem and unsafe_mem only.
View a Sync + Unpin self as &[u8]. Read more
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fn mem_as_bytes_mut(&mut self) -> &mut [u8]
where Self: Sync + Unpin,

Available on crate features mem and unsafe_mem only.
View a Sync + Unpin self as &mut [u8].
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impl<T> Size for T

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const BYTE_ALIGN: usize = _

Available on crate feature mem only.
The alignment of this type in bytes.
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const BYTE_SIZE: usize = _

Available on crate feature mem only.
The size of this type in bytes.
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const PTR_SIZE: usize = 8usize

Available on crate feature mem only.
The size of a pointer in bytes, for the current platform.
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fn byte_align(&self) -> usize

Available on crate feature mem only.
Returns the alignment of this type in bytes.
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fn byte_size(&self) -> usize

Available on crate feature mem only.
Returns the size of this type in bytes. Read more
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fn ptr_ratio(&self) -> (usize, usize)

Available on crate feature mem only.
Returns the size ratio between PTR_SIZE and BYTE_SIZE. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.