是否可以将 goto 与 switch 一起使用?

2022-01-19 00:00:00 switch-statement c++ goto

C# 似乎可以，但我需要 C++，最好是跨平台.

It seems it's possible with C#, but I need that with C++ and preferably cross platform.

基本上，我有一个开关，可以根据单个条件对内容进行排序，然后在其他所有内容上回退到默认处理.

Basically, I have a switch that sorts stuff on single criteria, and falls back to default processing on everything else.

说:

switch(color)
{
case GREEN:
case RED:
case BLUE:
    Paint();
    break;
case YELLOW:
    if(AlsoHasCriteriaX)
        Paint();
    else
        goto default;
    break;
default:
    Print("Ugly color, no paint.")
    break;
}

推荐答案

不完全是，但你可以这样做:

Not quite but you can do this: 

switch(color)
{
case GREEN:
case RED:
case BLUE:
     Paint();
     break;
case YELLOW:
     if(AlsoHasCriteriaX) {
         Paint();
         break; /* notice break here */
     }
default:
     Print("Ugly color, no paint.")
     break;
}

或者你可以这样做:

switch(color)
{
case GREEN:
case RED:
case BLUE:
     Paint();
     break;
case YELLOW:
     if(AlsoHasCriteriaX) {
         Paint();
         break; /* notice break here */
     }
     goto explicit_label;

case FUCHSIA:
     PokeEyesOut();
     break;

default:
explicit_label:
     Print("Ugly color, no paint.")
     break;
}

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