如何为自定义结构实现复制特征？

Question

我有我的自定义结构 - 交易，我想复制它。

This fails because Vec does not implement Copy for any T. E0204

如何实现复制到 Vec 和我的结构。我要举个例子。

#[derive(PartialOrd, Eq, Hash)]
struct Transaction {
    transaction_id: Vec<u8>,
    proto_id: Vec<u8>,
    len_field: Vec<u8>,
    unit_id: u8,
    func_nr: u8,
    count_bytes: u8,
}

impl Copy for Transaction { }

impl Clone for Transaction {
    fn clone(&self) -> Transaction {
        *self
    }
}

impl PartialEq for Transaction {
    fn eq(&self, other: &Self) -> bool {
        self.unit_id == other.unit_id
            && self.func_nr == other.func_nr
            && self.count_bytes == other.count_bytes
    }
}

fn main() 
{
}

Answer 1

我已经解决了这个问题：我用表 [u8; 2] 而不是 Vec .

但我还是不明白为什么你不能在结构中使用向量并复制它。

#[derive(PartialOrd, Eq, Copy, Clone, Hash)]
struct Transaction {
    transaction_id: [u8; 2],
    proto_id:  [u8; 2],
    len_field: [u8; 2],
    unit_id: u8,
    func_nr: u8,
    count_bytes: u8,
}

impl PartialEq for Transaction {
    fn eq(&self, other: &Self) -> bool {
        self.unit_id == other.unit_id
            && self.func_nr == other.func_nr
            && self.count_bytes == other.count_bytes
    }
}

如何为自定义结构实现复制特征？

How to implement Copy trait for Custom struct?

struct

traits

rust