// 代码 const MAX:usize = 10; struct Node { value: u64, child: [Option<Box>; MAX] }
static mut ROOT: [Option<Box>; MAX] = [None; MAX];
fn main() { }
// 编译报错，这个Copy trait死活搞不定了
error[E0277]: the trait bound std::option::Option<std::boxed::Box<Node>>: std::marker::Copy is not satisfied
--> src\main.rs:8:45
|
8 | static mut ROOT: [Option<Box>; MAX] = [None; MAX];
| ^^^^^^^^^^^ the trait std::marker::Copy is not implemented for std::option::Option<std::boxed::Box<Node>>
|
= help: the following implementations were found:
<std::option::Option as std::marker::Copy>
= note: the Copy trait is required because the repeated element will be copied
= note: this array initializer can be evaluated at compile-time, for more information, see issue https://github.com/rust-lang/rust/issues/49147
error: aborting due to previous error
For more information about this error, try rustc --explain E0277.
评论区
写评论static mut ROOT: [Option; MAX] = [None, None, None, None, None, None, None, None, None, None];
或者
static mut ROOT: [Option; MAX] = Default::default();