add ownership.md

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sunface
2022-02-25 17:34:45 +08:00
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# Ownership and Borrowing
# 所有权与借用
学习资料 :
- English: [Rust Book 4.1-4.4](https://doc.rust-lang.org/book/ch04-00-understanding-ownership.html)
- 简体中文: [Rust语言圣经 - 所有权与借用(https://course.rs/basic/ownership/index.html)

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# Ownership
# 所有权
🌟🌟
```rust,editable
fn main() {
// 只能修改下面这行代码! 使用尽可能多的方法来通过编译
let x = String::from("hello, world");
let y = x;
println!("{},{}",x,y);
}
```
🌟🌟
```rust,editable
// 不要修改 main 中的代码
fn main() {
let s1 = String::from("hello, world");
let s2 = take_ownership(s1);
println!("{}", s2);
}
// 只能修改下面的代码!
fn take_ownership(s: String) {
println!("{}", s);
}
```
🌟🌟
```rust,editable
fn main() {
let s = give_ownership();
println!("{}", s);
}
// 只能修改下面的代码!
fn give_ownership() -> String {
let s = String::from("hello, world");
// convert String to Vec
// 将 String 转换成 Vec 类型
let _s = s.into_bytes();
s
}
```
🌟🌟
```rust,editable
// 使用 clone 来让代码通过编译
fn main() {
let s = String::from("hello, world");
print_str(s);
println!("{}", s);
}
fn print_str(s: String) {
println!("{}",s)
}
```
🌟🌟
```rust, editable
// 不要使用 clone使用 copy 的方式替代
fn main() {
let x = (1, 2, (), "hello");
let y = x.clone();
println!("{:?}, {:?}", x, y);
}
```