fnis_copy<T: Copy>() {}fntypes_impl_copy_trait() { is_copy::<bool>(); is_copy::<char>();// all iXX and uXX, usize/isize, fXX implement Copy trait is_copy::<i8>(); is_copy::(); is_copy::(); is_copy::<usize>();// function (actually a pointer) ...
types_impl_copy_trait里的类型都是实现了Copy trait的。 fn is_copy<T: Copy>() {} fn types_impl_copy_trait() { is_copy::<bool>(); is_copy::<char>(); // all iXX and uXX, usize/isize, fXX implement Copy trait is_copy::<i8>(); is_copy::(); is_copy::(); is_copy::<...
验证是否实现了Copy trait。types_impl_copy_trait里的类型都是实现了Copy trait的。 代码语言:javascript 代码运行次数:0 fn is_copy<T:Copy>(){}fntypes_impl_copy_trait(){is_copy::<bool>();is_copy::<char>();// all iXX and uXX, usize/isize, fXX implement Copy traitis_copy::<i8>();...
// error:the trait `Copy` may not be implemented for this type// because its nums field does not implement `Copy`#[derive(Copy,Clone)]struct Numbers{nums:Vec<i32>} 当然,你也可以手动实现 Copy 和 Clone: struct Point{x:i32,y:i32,}// marker traitimplCopyforPoint{}implCloneforPoint{fncl...
Compiling rust-boom v0.1.0 (/Users/wmc/workspace/rust-boom) error[E0382]: borrow of moved value: `a` --> examples/move_copy_clone.rs:16:27 | 13 | let a = String::from("hello"); | - move occurs because `a` has type `String`, which does not implement the `Copy` trait 14 ...
结构可以是Copy,而i32是Copy,因此Point有资格成为Copy。相比之下,考虑 structPointList{points: Vec<Point>, } 结构PointList无法实现Copy,因为Vec<T>不是Copy。如果我们尝试派生Copy实现,我们会得到一个错误: the trait `Copy` maynotbe implementedforthistype; field `points` doesnotimplement `Copy` ...
moveoccurs because `string_obj` hastype`String`, which does not implement the `Copy`trait 在值对象的示例中,并没有这样的错误,也由此可推断值对象是实现了Copy Trait的,并且在作用域切换的场景中,直接使用Copy,在官方文档中,关于Copy特别说明了是简单的二进制拷贝。
| -- move occurs because `s1` hastype`String`,whichdoes not implement the `Copy` trait 4 |lets2 = s1; | -- value moved here 5 | 6 | println!("{}, world!", s1); | ^^ value borrowed here after move | = note: this error originatesinthe macro `$crate::format_args_nl` (in...
-- move occurs because `s1` hastype`String`, which does not implement the `Copy` trait 3 | let s2 = s1; -- value moved here 4 | 5 | println!("{}, world!", s1); ^^ value borrowed here after move For more information about thiserror, try `rustc --explain E0382`. ...
| -- move occurs because `s1` has type `String`, which does not implement the `Copy` trait 4 | let s2 = s1; | -- value moved here 5 | 6 | println!("{}, world!", s1); | ^^ value borrowed here after move | = note: this error originates in the macro `$crate::format_...