iPhone SDK Objective C是否支持函数内部的功能？ [英] Does iPhone SDK Objective C support functions inside of functions?

问题描述

我知道javascript，例如支持函数内部的函数，如下所示：

I know that javascript, for example supports functions inside of functions, like so:

function doSomething(){

  function doAnothingThing(){
    //this function is redefined every time doSomething() is called and only exists inside doSomething()    
  }

  //you can also stick it inside of conditions

  if(yes){
    function doSomethingElse(){
      //this function only exists if yes is true
    }
  }


}

objective-c支持这个？理论示例：

Does objective-c support this? Theoretical example:

 -(void) doSomething:(id) sender{
   -(void) respondToEvent: (id) sender{
     //theoretically? ... please?
   }
}

BONUS：本地的正确用语是什么函数？

BONUS: What is the proper term for a "local" function?

推荐答案

通常的术语是嵌套函数。 gcc支持嵌套函数作为C的扩展（默认情况下禁用）。我认为这个选项不适用于带有gcc的Objective-C（或C ++），即使使用它也可能不是一个好主意（可移植性等）。

The usual term is nested function. gcc supports nested functions as an extension to C (disabled by default). I don't think this option is available with Objective-C (or C++) with gcc though, and even if it were it's probably not a good idea to use it (portability etc).

gcc.gnu.org/onlinedocs/gcc/Nested-Functions。 html

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