c_variadic

The tracking issue for this feature is: #44930


The c_variadic language feature enables C-variadic functions to be defined in Rust. They may be called both from within Rust and via FFI.

Examples

#![allow(unused)] #![feature(c_variadic)] fn main() { pub unsafe extern "C" fn add(n: usize, mut args: ...) -> usize { let mut sum = 0; for _ in 0..n { sum += args.arg::<usize>(); } sum } }