# Struct std::ffi::VaList

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    pub struct VaList<'a, 'f>where
        'f: 'a,{ /* private fields */ }

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

A wrapper for a `va_list`

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

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

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

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

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#### pub unsafe fn arg<T>(&mut self) -> Twhere T: VaArgSafe,

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

Advance to the next arg.

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#### pub unsafe fn with_copy<F, R>(&self, f: F) -> Rwhere F: for<'copy> FnOnce(VaList<'copy, 'f>) -> R,

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

Copies the `va_list` at the current location.

## Trait Implementations§

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

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

Formats the value using the given formatter. Read more
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### impl<'a, 'f> Deref for VaList<'a, 'f>where 'f: 'a,

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

The resulting type after dereferencing.
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#### fn deref(&self) -> &VaListImpl<'f>

Dereferences the value.
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### impl<'a, 'f> DerefMut for VaList<'a, 'f>where 'f: 'a,

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#### fn deref_mut(&mut self) -> &mut VaListImpl<'f>

Mutably dereferences the value.

## Auto Trait Implementations§

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

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

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

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### impl<'a, 'f> Unpin for VaList<'a, 'f>

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

## Blanket Implementations§

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### impl<T> Any for Twhere 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> Borrow<T> for Twhere 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 Twhere 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 Twhere 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, U> TryFrom<U> for Twhere 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 Twhere 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.