usestd::fs::File;usestd::io::ErrorKind;fnmain(){letgreeting_file_result=File::open("hello.txt");letgreeting_file=matchgreeting_file_result{Ok(file)=>file,Err(error)=>matcherror.kind(){ErrorKind::NotFound=>match
function: 一个Option<&'a str>类型的字段,表示函数名。如果不可用,则为None。 这个结构体的一个主要作用是提供给panic宏的panic!(...)宏在出现panic时输出更加详细的错误信息,包括panic的文件名、行号、列号和函数名等等。 此外,Location<'a>结构体还定义了一些辅助方法来获取和打印位置信息,包括: fn file(...
当poll时发现值是有效的,直接就Poll::Ready返回,否则把wake函数注册到socket的set_readable_callback里,然后返回状态Pending,等到时有有效的值之后socket就会执行我们的wake方法,然后我们的wake方法里面有调用poll的逻辑,这样就完成poll的触发了。 这个不是持续性的,因为socket在自身拿到值之后才会触发wake通知future去再次...
that always happens at an.await. If your function behaves correctly even if it is restarted while waiting at an.await, then it is cancellation safe.
enum Message { Quit, Move { x: i32, y: i32 }, Write(String), ChangeColor(i32, i32, i32), } impl Message { fn call(&self) { // 在这里定义方法体 } } let m = Message::Write(String::from("hello")); m.call(); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14...
MacroFile:表示宏所在的文件,记录了宏声明的位置信息。 MacroCallId(salsa::InternId):表示宏调用的唯一标识符,用于在代码中引用不同的宏调用。 MacroCallLoc:表示宏调用的位置信息。 MacroDefId:表示宏定义的唯一标识符,用于在代码中引用不同的宏定义。 EagerCallInfo:包含了关于宏调用展开的一些信息,如宏调用所在的...
To compile a function, call__jit__()on it. deffoo():a =5return10+ a foo.__jit__()# this will compile foo to native code and subsequent calls will execute that native codeassertfoo() ==15 Embedding RustPython into your Rust Applications ...
KiteSQL - SQL as a Function for Rust lancedb [vectordb] - A serverless, low-latency vector database for AI applications Limbo - Limbo is a work-in-progress, in-process OLTP database management system, compatible with SQLite. Lucid - High performance and distributed KV store accessible throug...
Create a file in the same directory as Cargo.toml called build.rs (if you didn't already have a build script) and paste this into it: usestd::env;usestd::path::PathBuf;fnmain(){lettarget = env::var("TARGET").unwrap();iftarget.contains("pc-windows"){letmanifest_dir =PathBuf::fr...
Returning values from a function The callVec::new()constructs a new vector, and returns, not a pointer to the vector, but the vector itself: its ownership moves fromVec::newto the variablecomposers. Similarly, theto_stringcall returns a freshStringinstance. ...