切换 if-else 语句的优点

What's the best practice for using a switch statement vs using an if statement for 30 unsigned enumerations where about 10 have an expected action (that presently is the same action). Performance and space need to be considered but are not critical. I've abstracted the snippet so don't hate me for the naming conventions.

switch 语句:

// numError is an error enumeration type, with 0 being the non-error case
// fire_special_event() is a stub method for the shared processing

switch (numError)
{  
  case ERROR_01 :  // intentional fall-through
  case ERROR_07 :  // intentional fall-through
  case ERROR_0A :  // intentional fall-through
  case ERROR_10 :  // intentional fall-through
  case ERROR_15 :  // intentional fall-through
  case ERROR_16 :  // intentional fall-through
  case ERROR_20 :
  {
     fire_special_event();
  }
  break;

  default:
  {
    // error codes that require no additional action
  }
  break;       
}

if 语句:

if ((ERROR_01 == numError)  ||
    (ERROR_07 == numError)  ||
    (ERROR_0A == numError)  || 
    (ERROR_10 == numError)  ||
    (ERROR_15 == numError)  ||
    (ERROR_16 == numError)  ||
    (ERROR_20 == numError))
{
  fire_special_event();
}

推荐答案

使用开关.

在最坏的情况下，编译器将生成与 if-else 链相同的代码，因此您不会丢失任何内容.如果有疑问，请将最常见的情况放在 switch 语句中.