Struct VaList 

pub struct VaList<'a, '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>>

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

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

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

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

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

Advance to and read the next variable argument.

Safety

This function is only sound to call when:

• there is a next variable argument available.
• the next argument’s type must be ABI-compatible with the type T.
• the next argument must have a properly initialized value of type T.

Calling this function with an incompatible type, an invalid value, or when there are no more variable arguments, is unsound.

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

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

Formats the value using the given formatter.

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

type Target = VaListImpl<'f>

The resulting type after dereferencing.

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

Dereferences the value.

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

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

Mutably dereferences the value.