update at 2020-06-16 18:11:50 by ehlxr
This commit is contained in:
commit
4c9a6dec3c
4
.gitignore
vendored
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4
.gitignore
vendored
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/target
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**/*.rs.bk
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.vscode
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.idea
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58
Cargo.lock
generated
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58
Cargo.lock
generated
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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[[package]]
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name = "hello_macro"
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version = "0.1.0"
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[[package]]
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name = "hello_macro_derive"
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version = "0.1.0"
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dependencies = [
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"quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
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"syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "proc-macro2"
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version = "0.4.30"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "quote"
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version = "0.6.13"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "rust_study"
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version = "0.1.0"
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dependencies = [
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"hello_macro 0.1.0",
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"hello_macro_derive 0.1.0",
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]
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[[package]]
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name = "syn"
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version = "0.14.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
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"quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
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"unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "unicode-xid"
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version = "0.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[metadata]
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"checksum proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)" = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
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"checksum quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
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"checksum syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)" = "261ae9ecaa397c42b960649561949d69311f08eeaea86a65696e6e46517cf741"
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"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
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9
Cargo.toml
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9
Cargo.toml
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[package]
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name = "rust_study"
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version = "0.1.0"
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authors = ["ehlxr <ehlxr.me@gmail.com>"]
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edition = "2018"
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[dependencies]
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hello_macro = { path = "../hello_macro" }
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hello_macro_derive = { path = "../hello_macro/hello_macro_derive" }
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1488
src/main.rs
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1488
src/main.rs
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File diff suppressed because it is too large
Load Diff
21
src/ownership_1.rs
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21
src/ownership_1.rs
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fn main() {
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let s = String::from("hello"); // s 进入作用域
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takes_ownership(s);// s 的值移动到函数里 ...
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// ... 所以到这里不再有效
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let x = 5;// x 进入作用域
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makes_copy(x);// x 应该移动函数里,
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// 但 i32 是 Copy 的,所以在后面可继续使用 x
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} // 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
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fn takes_ownership(some_string: String) { // some_string 进入作用域
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println!("{}", some_string);
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} // 这里,some_string 移出作用域并调用 `drop` 方法。占用的内存被释放
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fn makes_copy(some_integer: i32) { // some_integer 进入作用域
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println!("{}", some_integer);
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} // 这里,some_integer 移出作用域。不会有特殊操作
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21
src/ownership_2.rs
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21
src/ownership_2.rs
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fn main() {
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let s1 = gives_ownership(); // gives_ownership 将返回值 移给 s1
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println!("{}", s1);
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let s2 = String::from("hello"); // s2 进入作用域
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// println!("{}", s2);
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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
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println!("{}", s3);
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} // 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
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fn gives_ownership() -> String { // gives_ownership 将返回值移动给调用它的函数
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let some_string = String::from("hello"); // some_string 进入作用域.
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some_string // 返回 some_string 并移出给调用的函数
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}
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// takes_and_gives_back 将传入字符串并返回该值
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fn takes_and_gives_back(a_string: String) -> String { // a_string 进入作用域
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a_string
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// 返回 a_string 并移出给调用的函数
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}
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