std::ffi::VaList - Rust
Description: API documentation for the Rust `VaList` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, VaList

# [−][src]Struct std::ffi::VaList

    #[repr(transparent)]
    pub struct VaList<'a, 'f> where
        'f: 'a,
        'f: 'a,
        'f: 'f,  { /* fields omitted */ }

🔬 This is a nightly-only experimental API. (`c_variadic` #44930)

the `c_variadic` feature has not been properly tested on all supported platforms

A wrapper for a `va_list`

## Methods from Deref<Target = VaListImpl<'f>>

#### `pub fn as_va_list(&'a mut self) -> VaList<'a, 'f>`[src]

🔬 This is a nightly-only experimental API. (`c_variadic` #44930)

the `c_variadic` feature has not been properly tested on all supported platforms

Convert a `VaListImpl` into a `VaList` that is binary-compatible with C's `va_list`.

#### `pub unsafe fn arg<T>(&mut self) -> T where
T: VaArgSafe,` [src]

🔬 This is a nightly-only experimental API. (`c_variadic` #44930)

the `c_variadic` feature has not been properly tested on all supported platforms

Advance to the next arg.

#### `pub unsafe fn with_copy<F, R>(&self, f: F) -> R where
F: FnOnce(VaList<'copy, 'f>) -> R,` [src]

🔬 This is a nightly-only experimental API. (`c_variadic` #44930)

the `c_variadic` feature has not been properly tested on all supported platforms

Copies the `va_list` at the current location.

## Trait Implementations

### `impl<'a, 'f> DerefMut for VaList<'a, 'f> where
'f: 'a,` [src]

#### `fn deref_mut(&mut self) -> &mut VaListImpl<'f>`[src]

Mutably dereferences the value.

### `impl<'a, 'f> Deref for VaList<'a, 'f> where
'f: 'a,` [src]

#### `type Target = VaListImpl<'f>`

The resulting type after dereferencing.

#### `fn deref(&self) -> &VaListImpl<'f>`[src]

Dereferences the value.

### `impl<'a, 'f> Debug for VaList<'a, 'f> where
'f: 'a,` [src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

Formats the value using the given formatter. Read more

## Auto Trait Implementations

### `impl<'a, 'f> !UnwindSafe for VaList<'a, 'f>`

### `impl<'a, 'f> RefUnwindSafe for VaList<'a, 'f>`

### `impl<'a, 'f> Unpin for VaList<'a, 'f> where
'f: 'a,`

### `impl<'a, 'f> !Send for VaList<'a, 'f>`

### `impl<'a, 'f> !Sync for VaList<'a, 'f>`

## Blanket Implementations

### `impl<T> From<T> for T`[src]

#### `fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `fn into(self) -> U`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

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

The type returned in the event of a conversion error.

#### `fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut I

### Important traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, R: Read + ?Sized> Read for &'_ mut Rimpl<'_, W: Write + ?Sized> Write for &'_ mut W`
`fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut I

### Important traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, R: Read + ?Sized> Read for &'_ mut Rimpl<'_, W: Write + ?Sized> Write for &'_ mut W`
`fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more