包含引用的可能变体的枚举数组[重复]

Question

这个问题在这里已有答案：

• Initialize a large, fixed-size array with non-Copy types 3回答
• What is the proper way to initialize a fixed length array? 2回答

我尝试编写战列舰的纸质游戏，其中战场是枚举阵列。我找不到初始化数组的方法。

enum Tile {
    Water,
    Debris,
    Ship(Rc<Ship>),
}

fn main() {
    let mut a = [[Tile::Water; 10]; 10]; //Tile::Water doesn't implement Copy (the compiler is dumb)
    let mut b: [[Tile; 10]; 10];
    for i in 1..10 {
        for j in 1..10 {
            b[i][j] = Tile::Water;
        }
    } //use of possibly uninitialized b (I'm trying to initialize it)
}

如何才能做到这一点？我不是在寻找另一种游戏解决方案，这只是一个例子。

Answer 1

试试这个：

enum Tile {
    Water,
    Debris,
    Ship(Rc<Ship>),
}

impl Default for Tile {
    fn default() -> Self {
        Tile::Water
    }
}

fn main() {
    let mut b: [[Tile; 10]; 10] = Default::default();
}