rust - static 或 const 中的 `&str` 和 `&' static str` 有什么区别？

Question

我是 Rust 编程和学习生命周期的新手。

const CONST_MEEP: &str = "MEEP";
const CONST_LIFETIME_MEEP: &'static str = "MEEP";
static STATIC_MEEP: &'static str = "MEEP";
static STATIC_LIFETIME_MEEP: &str = "MEEP";

fn main() {
    println!("CONST_MEEP is {}", CONST_MEEP);
    println!("CONST_LIFETIME_MEEP is {}", CONST_LIFETIME_MEEP);
    println!("STATIC_MEEP is {}", STATIC_MEEP);
    println!("STATIC_LIFETIME_MEEP is {}", STATIC_LIFETIME_MEEP);
}

输出:

CONST_MEEP is MEEP
CONST_LIFETIME_MEEP is MEEP
STATIC_MEEP is MEEP
STATIC_LIFETIME_MEEP is MEEP

CONST_MEEP 和 CONST_LIFETIME_MEEP 有什么区别？ STATIC_MEEP 和 STATIC_LIFETIME_MEEP 有什么区别？

Answer 1

没什么，没有区别。截至RFC 1623 , static 和 const 项中的引用自动为 'static。这在 Rust 1.17 生效.