# [−][src]Struct std::ffi::VaList

    #[lang = "va_list"]
    #[repr(transparent)]
    pub struct VaList<'a>(_);

🔬 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

### `impl<'a> VaList<'a>`[src]

#### `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 copy<F, R>(&self, f: F) -> R where
F: FnOnce(VaList<'copy>) -> 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> Debug for VaList<'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> !Send for VaList<'a>`

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

## Blanket Implementations

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

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

Performs the conversion.

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

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

Performs the conversion.

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

####
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;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 for T where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;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

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