说明:牛肉
Cow更快,更紧凑的实现。
---
use beef :: Cow;
let borrowed: Cow = Cow :: borrowed ( "Hello" );
let owned: Cow = Cow :: owned ( String :: from ( "World" ));
assert_eq! (
format! ( "{} {}!" , borrowed, owned),
"Hello World!" ,
);
此板条箱暴露了Cow两个版本:
be
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