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>where
    'f: 'a,

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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,

const: unstable · source§

fn borrow(&self) -> &T

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

const: unstable · source§

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

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source§

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.
const: unstable · source§

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.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.