trait 有很多,比如Copy,Clone,Debug,Default,Drop,Hash,Ord,PartialOrd,Send,Sync等等,先挑几种最常用的学一下: #[derive(Debug)] 在Rust 语言中用于自动生成一个结构体的 Debug 实现,Debug 是 Rust 标准库中的一个 trait,用于在控制台打印调试信息。 使用#[derive(Debug)] 属性可以为结构体自动生成一个 Debu...
trait Pilot{fnfly(&self);}trait Wizard{fnfly(&self);}struct Human;impl PilotforHuman{fnfly(&self){println!("This is your captain speaking.");}}impl WizardforHuman{fnfly(&self){println!("Up!");}}impl Human{fnfly(&self){println!("*waving arms furiously*");} 复制代码 上例中我们定...
$ cargo run Compiling traits-example v0.1.0 (file:///projects/traits-example)error[E0277]: `Point` doesn't implement `std::fmt::Display` --> src/main.rs:20:6 |3 | trait OutlinePrint: fmt::Display { | --- required by this bound in `OutlinePrint`...20 | impl OutlinePrint for ...
error[E0277]: `Rectangle` doesn't implement `Debug` = help: the trait `Debug` is not implemented for `Rectangle` = note: add `#[derive(Debug)]` to `Rectangle` or manually `impl Debug for Rectangle` Rust 有输出调试信息的能力,但我们必须为我们的结构体结构体手动开启它。加入一条外部属性(...
trait Run { fn run_and_die(self); } #[derive(Debug)] struct Horse { } impl Run for Horse { fn run_and_die(self) { } } fn main() { let h = Horse {}; h.run_and_die(); //println!("{:?}", h); //这行会导致失败,因为run_and_die会消耗自己 } 11、Derive ...
Print the value of object x having custom type T, for log or debug. 打印自定义类型的值 代码语言:javascript 代码运行次数:0 运行 AI代码解释 package main import ( "fmt" ) // T represents a tank. It doesn't implement fmt.Stringer. type T struct { name string weight int firePower int }...
| --- move occurs becausephas typePoint, which does not implement theCopytrait 12 | p.x += 1; 13 | f2(p); | - value moved here 14 | println!("{},{}", p.x, p.y); | ^^^ value borrowed here after move | = note: this error originates in the macro$crate::format_args_...
'std::vec::Vec <Cereal>', which does not implement the 'Copy' trait 9 | grains.push(Cereal::Rye); 10 | drop(grains); | --- value moved here 11 | 12 | println!("{:?}", grains); | ^^^ value borrowed here after move error: aborting...
给定Pin<P<T>>类型的数据,只要T不满足 Unpin trait,则 Safe Rust(即不使用unsafe{}块)下无法获得&mut T和T。换言之,要想Pin有其效果,则T必须不满足 Unpin trait; 在理解了以上几条,我们来简单快速尝试一下Pin: usestd::pin::Pin;#[derive(Debug)]structFoo{ ...
The plan is to have rustc use thechalk-solvecrate (in this repo) to answer questions about Rust programs, for example, "DoesVecimplementDebug?". Internally, chalk converts Rust-specific information into logic and uses a logic engine to find the answer to the original query. For more detail...