push也十分类似: impl<T>Stack<T>{pubfnpush(&self,t:T){// allocate the node, and immediately turn it into a *mut pointerletn=Box::into_raw(Box::new(Node{data:t,next:null_mut(),}));loop{// snapshot current headlethead=self.head.load(Relaxed);// update `next` pointer with snap...
status.code()) } } // 使用泛型参数 pub fn execute_generics(cmd: &impl Executor) -> Result<Option<i32>, BoxedError> { cmd.run() } // 使用 trait object: &dyn T pub fn execute_trait_object(cmd: &dyn Executor) -> Result<Option<i32>, BoxedError> { cmd.run() } // 使用 trait ...
pub fn unwrap_ref_without_panic<T>(x: &Result<T, Infallible>) -> &T { match x { Ok(x) => x, // this arm cannot be omitted because of the reference Err(infallible) => match *infallible {}, } } To avoid interfering with crates that wish to support several Rust versions, matc...
span_mirrors_attr: 该宏类似于上述span_mirrors_res宏,不同之处在于它用于为属性(attribute)获取关联的源代码位置。 validate_and_turn_into_dyn: 该函数用于验证并将给定的类型转换成动态(trait object)类型。它接受一些类型参数,包括所需的trait类型、试图转换的类型和相关的源代码位置,然后在运行时进行类型检查。
impl<T>Stack<T>{pubfnpush(&self,t:T){// allocate the node, and immediately turn it into a *mut pointer let n = Box::into_raw(Box::new(Node { data: t, next: null_mut(), })); loop { // snapshot current head let head = self.head.load(Relaxed); // ...
impl<T> Atomic<T> { pub fn cas(&self, old: Option<Shared<T>>, new: Option<Owned<T>>, ord: Ordering) -> Result<(), Option<Owned<T>>>; } 与store一样,此操作不需要Guard; 它不产生新的生命周期信息。结果返回CAS是否成功; 如果不成功,新指针的所有权将返回给调用者。 我们有一个类似的...
old: Option<Shared<T>>, new: Option<Owned<T>>, ord: Ordering) -> Result<(),Option<Owned<T>>>; } 1. 2. 3. 4. 5. 6. 7. 与store一样,此操作不需要Guard; 它不产生新的生命周期信息。结果返回CAS是否成功; 如果不成功,新指针的所有权将返回给调用者。
We do already have{Option, Result}::expectwhich serves a similar-ish purpose of "unwrap with a reason". I argue that this doesn't necessarily map as nicely onto the semantics oftodo. While this feature can be emulated with.expect("todo"), this is frustrating to type, easy to typo, ha...
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# command line, using the provided default value (0/1) for the option # if not present, and saves it to the generated config.mk. # # `opt_nosave` is much the same, except that it does not save the # result to config.mk (instead the script should use `putvar` itself #...