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Struct std::ffi::VaList

pub struct VaList<'a, 'f>
where
    'f: 'a,{ /* private fields */ }
🔬This is a nightly-only experimental API. (c_variadic #44930)

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) -> T
where
    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) -> R
where
    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,
 
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

impl<'a, 'f> RefUnwindSafe for VaList<'a, 'f>
impl<'a, 'f> !Send for VaList<'a, 'f>
impl<'a, 'f> !Sync for VaList<'a, 'f>
impl<'a, 'f> Unpin for VaList<'a, 'f>
impl<'a, 'f> !UnwindSafe for VaList<'a, 'f>

Blanket Implementations

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impl<T> Any for T
where
    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 T
where
    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 T
where
    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 T
where
    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 T
where
    U: Into<T>,
 
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 T
where
    U: TryFrom<T>,
 
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.

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/ffi/struct.VaList.html