错误处理-错误传播 [英] Error Handling - Error Propagation

问题描述

我有三个职能。 A --calling-> B --calling-> C.没有任何闭包参数的简单函数，例如读取plist的函数，验证...

I have three functions. A --calling--> B --calling--> C. Simple functions without any closure arguments, say functions for reading plist, validations...

C中出现错误。我在这里使用Do / Try / Catch在函数之间传递错误。

Say an error arises in C. I am using Do/Try/Catch here to pass the errors across functions.

static func a(param: int)
{
    do
    {
       try b()
    }
    catch
    {

    }
} 

static func b(param: int)
{
     //specific tasks in func b
    c(1) //CAN I PASS THE ERROR TO FUNC a() without do/try/catch block?
}

static func c(param : int) throws
{
     //Error created and throw’ed
}

顾名思义，我尝试过使用throw，但是需要使用throw进行封闭！
是否有其他选择？

I tried using rethrow, as the name suggests, but it needs a closure with throw! Any alternatives?

推荐答案

b（）必须是标记为抛出，需要调用尝试c（1）。
但是您不需要做捕获块。因此

b() must be marked with throws, and needs to call try c(1). But you don't need a do-catch-block. So

func b(param: Int) throws {
    // do something ...
    try c(1)
    // do more ...
}

将将在 c（）中引发的错误传播给 b（）的调用者。

will propagate an error thrown in c() to the caller of b().

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