update at 2020-06-16 18:11:50 by ehlxr

This commit is contained in:
ehlxr 2020-06-16 18:11:50 +08:00
commit 4c9a6dec3c
7 changed files with 1602 additions and 0 deletions

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.gitignore vendored Normal file
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/target
**/*.rs.bk
.vscode
.idea

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Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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Cargo.toml Normal file
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[package]
name = "rust_study"
version = "0.1.0"
authors = ["ehlxr <ehlxr.me@gmail.com>"]
edition = "2018"
[dependencies]
hello_macro = { path = "../hello_macro" }
hello_macro_derive = { path = "../hello_macro/hello_macro_derive" }

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hello.txt Normal file
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ehlxr

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src/main.rs Normal file

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src/ownership_1.rs Normal file
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fn main() {
let s = String::from("hello"); // s 进入作用域
takes_ownership(s);// s 的值移动到函数里 ...
// ... 所以到这里不再有效
let x = 5;// x 进入作用域
makes_copy(x);// x 应该移动函数里,
// 但 i32 是 Copy 的,所以在后面可继续使用 x
} // 这里, x 先移出了作用域,然后是 s。但因为 s 的值已被移走,所以不会有特殊操作
fn takes_ownership(some_string: String) { // some_string 进入作用域
println!("{}", some_string);
} // 这里some_string 移出作用域并调用 `drop` 方法。占用的内存被释放
fn makes_copy(some_integer: i32) { // some_integer 进入作用域
println!("{}", some_integer);
} // 这里some_integer 移出作用域。不会有特殊操作

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src/ownership_2.rs Normal file
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fn main() {
let s1 = gives_ownership(); // gives_ownership 将返回值 移给 s1
println!("{}", s1);
let s2 = String::from("hello"); // s2 进入作用域
// println!("{}", s2);
let s3 = takes_and_gives_back(s2); // s2 被移动到 takes_and_gives_back 中, 它也将返回值移给 s3
println!("{}", s3);
} // 这里, s3 移出作用域并被丢弃。s2 也移出作用域但已被移走所以什么也不会发生。s1 移出作用域并被丢弃
fn gives_ownership() -> String { // gives_ownership 将返回值移动给调用它的函数
let some_string = String::from("hello"); // some_string 进入作用域.
some_string // 返回 some_string 并移出给调用的函数
}
// takes_and_gives_back 将传入字符串并返回该值
fn takes_and_gives_back(a_string: String) -> String { // a_string 进入作用域
a_string
// 返回 a_string 并移出给调用的函数
}