我如何声明“静态"Rust 结构中的字段? [英] How do I declare a "static" field in a struct in Rust?

问题描述

如何在 Rust 的结构中声明静态"字段，最好使用默认值:

How do I declare a "static" field in a struct in Rust, preferably with a default value:

struct MyStruct {
    x: i32,               // instance
    y: i32,               // instance
    my_static: i32 = 123, // static, how?
}

fn main() {
    let a = get_value();
    if a == MyStruct::my_static {
        //...
    } else {
        //...
    }
}

推荐答案

Rust 不支持结构中的静态字段，因此您不能这样做.您可以获得的最接近的是关联方法:

Rust does not support static fields in structures, so you can't do that. The closest thing you can get is an associated method:

struct MyStruct {
    x: i32,
    y: i32,
}

impl MyStruct {
    #[inline]
    pub fn my_static() -> i32 {
        123
    }
}

fn main() {
    let a = get_value();
    if a == MyStruct::my_static() {
        //...
    } else {
        //...    
    }
}

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