mirror of
https://github.com/KaiserY/trpl-zh-cn
synced 2025-04-22 21:48:04 +08:00
15 lines
374 B
Rust
15 lines
374 B
Rust
fn main() {
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let s1 = String::from("hello");
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let len = calculate_length(&s1);
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println!("The length of '{s1}' is {len}.");
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}
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// ANCHOR: here
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fn calculate_length(s: &String) -> usize { // s 是 String 的引用
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s.len()
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} // 这里，s 离开了作用域。但因为它并不拥有引用值的所有权，
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// 所以什么也不会发生
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// ANCHOR_END: here
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