在Rust中使用“match”和嵌套的“enum”有很多方法可以解决这个问题;你选择哪一个当然部分是你的设计决定...
fnignore_values(value:(i32,i32)){match value{(_,0)=>println!("Ignore the second value"),(x,_)=>println!("x: {}",x),}}fnmain(){ignore_values((10,0));// Output: Ignore the second valueignore_values((20,30));// Output: x: 20} 在上述代码中,ignore_values函数接收一个元组作...
The function returns the enum with doubled values. The function also copies the discriminant field to the enum being returned.; The caller passes the following parameters: ; 🔡 rsi: Address of the enum ; 🔡 rdi: Address of the enum to be returned. example::double: mov rax, rdi ; ...
在Rust中使用“match”和嵌套的“enum”有很多方法可以解决这个问题;你选择哪一个当然部分是你的设计决定...
总结起来,rust/compiler/rustc_mir_dataflow/src/rustc_peek.rs文件的作用是实现用于检查MIR流程的peek功能,通过SanityCheck结构体进行MIR数据流分析的断言验证,通过PeekCall结构体跟踪函数调用并记录相关信息,通过RustcPeekAt<'tcx> trait定义MIR的peek功能,以及通过PeekCallKind enum定义peek检查的类型。 File: rust/...
IIUC, we can add range metadata to other instructions. We just don't do that now. We can quickly get the range of arbitrary values when the source value provides range metadata. Adding range metadata for other instructions doesn't seem necessary if that's correct. ...
match m {} 模式匹配BK EX REF, 下面跟匹配分支. 参见下表. let S(x) = get(); 显然, let 也和下表的模式匹配类似. let S { x } = s; 仅将x 绑定到值 s.x. let (_, b, _) = abc; 仅将b 绑定到值 abc.1. let (a, ..) = abc; 也可以将「剩余的」都忽略掉. let (.., a...
enum ShirtColor { Red, Blue, } struct Inventory { shirts: Vec<ShirtColor>, } impl Inventory { fn giveaway(&self, user_preference: Option<ShirtColor>) -> ShirtColor { user_preference.unwrap_or_else(|| self.most_stocked()) } fn most_stocked(&self) -> ShirtColor { ...
{ id: i32, name: String, description: Option<String>, owner: GithubUser, stargazers_url: String, commits_url: String, contributors_url: String, } pub enum URL { WithBaseUrl(&'static str), WithoutBaseUrl(String), } impl URL { pub fn value(self) -> String { match self { URL::...
#![feature(const_fn)] pub enum A { B, C, } const fn foo(a: A) { match a { A::B => (), A::C => (), } } fn main() {} playpen: https://is.gd/n7pDFb rustc 1.17.0-nightly (e703b33e3 2017-03-23) error: internal compiler error: /checkout/src/li...