# Struct std::ffi::VaListImpl

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    #[repr(C)]pub struct VaListImpl<'f> { /* private fields */ }

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

x86_64 ABI implementation of a `va_list`.

## Implementations§

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### impl<'f> 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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### impl<'f> VaListImpl<'f>

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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<'f> Clone for VaListImpl<'f>

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

Returns a copy of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl<'f> Debug for VaListImpl<'f>

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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<'f> Drop for VaListImpl<'f>

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#### fn drop(&mut self)

Executes the destructor for this type. Read more

## Auto Trait Implementations§

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### impl<'f> RefUnwindSafe for VaListImpl<'f>

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### impl<'f> !Send for VaListImpl<'f>

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### impl<'f> !Sync for VaListImpl<'f>

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### impl<'f> Unpin for VaListImpl<'f>

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### impl<'f> !UnwindSafe for VaListImpl<'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> ToOwned for Twhere T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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.