//returnvalue into thefunction // that calls it letsome_string = String::from("yours"); // some_string comes into scope some_string // some_string is returned and // moves out to the calling //function } // Thisfunctiontakes a String and returns it fn takes_and_gives_back(a_string...
(value: std::io::Error) -> Self { Self::IOError(value) } } // 根据错误码显示不同的错误信息 impl std::fmt::Display for MyCustomError { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { // 根据不同的错误类型,输出不同的错误信息 match self { MyCustom...
// return value into the function // that calls it let some_string = String::from("yours"); // some_string comes into scope some_string // some_string is returned and // moves out to the calling // function } // This function takes a String and returns it fn takes_and_gives_ba...
AI代码解释 asyncfnmy_function()->ApiResponse{ApiResponse::JsonData(vec![Message{message:"hello 789".to_owned()}])} 当然,我们也可以对返回值使用 Result[6] 类型!尽管错误类型在技术上也可以接受任何可以转化为HTTP响应的内容,但我们也可以实现一个错误类型来表示HTTP请求在我们的应用程序中可能失败的几种...
const result = await callThreadsafeFunction((err, value) => { return value + 1 }) console.log(result) // 输出结果 // result: 2 // 2 正确处理 JS 函数的返回值 从前面call_async的实现可以看出,call_async返回的数据,也即 JS 函数返回值需要满足如下泛型约束D: 'static + FromNapiValue,而 nap...
println!("The value of y is: {}", y); } 1. 2. 3. 4. 5. 6. 7. 8. 四、函数返回 在 Rust 中函数就是表达式,因此我们可以把函数的返回值直接赋给调用者。 函数的返回值就是函数体最后一条表达式的返回值,当然我们也可以使用 return 提前返回,下面的函数使用最后一条表达式来返回...
return Err(crate::Error::from_status(Status::Closing)); } check_status!( unsafe { sys::napi_call_threadsafe_function( self.handle.get_raw(), Box::into_raw(Box::new(value.map(|data| { ThreadsafeFunctionCallJsBackData { data, call_variant: ThreadsafeFunctionCallVariant::WithCallback, ...
let data = if JsCast::is_instance_of::<Uint8Array>(&buffer) { JsValue::from(Array::from(&buffer)) 这一段Rust代码的特殊之处在于一些方法上加了这样的派生,所谓的派生,指的是我们只要加上这一段代码,编译器就会帮我们实现约定好的逻辑: ...
rs:8:33 | 8 | fn longest(x: &str, y: &str) -> &str { | --- --- ^ expected named lifetime parameter | = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from `x` or `y` help: consider introducing a named...
}fna_function(a:u64,b:char,c:bool)->char{println!("a is {}",a);println!("b is {}",b);println!("c is {}",c);return'N'; } 输出: Hello, world! Thevalueofxis5Thevalueofxis6moneyis100moneyis108moneyis一百元 Theconstantis888ais88bisM ...