靜態或const中`＆str`和`＆'static str`有什么區別？

Question

我是Rust編程的新手，也是關於生命周期的學習。

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);
}

輸出：

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

CONST_MEEP和CONST_LIFETIME_MEEP什么CONST_LIFETIME_MEEP ？ STATIC_MEEP和STATIC_LIFETIME_MEEP什么STATIC_LIFETIME_MEEP ？

Answer 1

沒什么，沒有區別。 從RFC 1623開始 ， static和const項中的引用自動為'static 。 這在Rust 1.17中生效。