首页 \ 问答 \ Swift Closure to String(Swift Closure to String)

Swift Closure to String(Swift Closure to String)

是否可以在Swift中在运行时解析闭包作为字符串? 例如:

let y = 5
let myClosure = { (x: Double) -> Double in
    return x * 2 + y
}

应该给我"x * 2 + 5" (例如函数调用closureToString(myClosure) )。 有可能做这样的事吗? 顺便说一句,我的意思是在运行时,因为y可以从命令行中读取。

我不认为这是可能的,只是寻找确认^^谢谢;)


Is it possible to parse a closure as string at runtime in Swift? For example:

let y = 5
let myClosure = { (x: Double) -> Double in
    return x * 2 + y
}

should give me "x * 2 + 5" (for example a function call closureToString(myClosure)). Is it possible to do something like this? Btw, I really mean at runtime because y could be read from Command Line for example.

I don't think it's possible, just looking for confirmation^^ thank you ;)


原文:https://stackoverflow.com/questions/31965987
更新时间:2024-05-08 15:05

最满意答案

只有在按下提交按钮时,才让required属性评估为true 。 您可以通过在请求参数映射中检查其客户端ID的存在来执行此操作,如下所示:

<h:inputText ... required="#{not empty param[button.clientId]}" />
...
<a4j:commandButton binding="#{button}" ... />

(不,你不需要将它绑定到bean属性,代码是完整的原样)


Let the required attribute evaluate true only if the submit button is pressed. You can do that by checking the presence of its client ID in the request parameter map like so:

<h:inputText ... required="#{not empty param[button.clientId]}" />
...
<a4j:commandButton binding="#{button}" ... />

(no, you do not need to bind it to a bean property, the code is complete as-is)

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