如何从Rust std库导入和引用枚举类型？
我试图使用std::sync::atomics模块中的Ordering枚举.
use std::sync::atomics::AtomicBool;
use std::sync::atomics::Ordering;
// error unresolved import: there is no `Relaxed` in `std::sync::atomics::Ordering`
// use std::sync::atomics::Ordering::Relaxed;
fn main() {
let mut ab = AtomicBool::new(false);
let val1 = ab.load(Ordering::Relaxed); // error: unresolved import:
// there is no `Relaxed` in `std::sync::atomics::Ordering`
println!("{:?}", val1);
ab.store(true, Ordering.Relaxed); // error: unresolved name `Ordering`
let val2 = ab.load(Ordering(Relaxed)); // error: unresolved name `Relaxed`
println!("{:?}", val2);
}
我目前使用的是Rust v.0.9.