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Initialize a large, fixed-size array with non-Copy types（8个答案）
21小时前关门了。
我试图在Rust中实现一个简单的带有外部链接的哈希表，但是在表声明方面遇到了麻烦。

static mut _HASH_TABLE: [Option<Box<MemoryMap>>; (std::u16::MAX -1) as usize] = [None; (std::u16::MAX -1) as usize];

其中MemoryMap是动态链接列表

pub struct MemoryMap {
    entry: SimpleEntry,
    next: Option<Box<MemoryMap>>,
}

impl MemoryMap {
    pub fn new(init_key: String, init_value: Box<dyn Storable>) -> MemoryMap {
        MemoryMap {
            entry: SimpleEntry::new(init_key, init_value),
            next: None,
        }
    }
//...
}

pub struct SimpleEntry {
    key: String,
    value: Box<dyn Storable>,
}

impl SimpleEntry {
    pub fn new(key: String, value: Box<dyn Storable>) -> SimpleEntry {
        SimpleEntry { key, value }
    }
//...
}

也就是说，我得到了这个错误

5 | static mut _HASH_TABLE: [Option<Box<MemoryMap>>; (std::u16::MAX -1) as usize] = [None; (std::u16::MAX -1) as usize];
  |                                                                                                                                                           ^^^^ the trait `Copy` is not implemented for `Box<MemoryMap>`
  |
  = note: required for `Option<Box<MemoryMap>>` to implement `Copy`
  = note: the `Copy` trait is required because this value will be copied for each element of the array

我不明白为什么要复制数组的元素，因为我希望数组获得Box<MemoryMap>的所有权