Struct std::ffi::VaList

#[repr(transparent)]
pub struct VaList<'a, 'f> where
    'f: 'a,  { /* fields omitted */ }

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

A wrapper for a va_list

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

pub fn as_va_list(&'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.

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.

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

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

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

Formats the value using the given formatter.

impl<'a, 'f> Deref for VaList<'a, 'f> where
    'f: 'a, 

type Target = VaListImpl<'f>

The resulting type after dereferencing.

pub fn deref(&self) -> &VaListImpl<'f>

Dereferences the value.

impl<'a, 'f> DerefMut for VaList<'a, 'f> where
    'f: 'a, 

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

Mutably dereferences the value.