在抛出异常后返回 [英] Returning after throwing exceptions

问题描述

在 throw 之后返回一个值有什么好处吗？如果没有，可以忽略 return 语句，并且它可以删除编译器错误 C4715：并非所有控制路径都返回值



(示例代码）

$

b
$ b

  for（ushort i = 0; i  if（unitFormation [i] == unit）
 {
 return unitSetup [i]; 
} 
 else 
 throw unit; 
 
 return 0; 
  

解决方案

无需在异常抛出后返回值。如果你有这个错误，你应该检查你的代码可以到达而不抛出异常的路径，例如

  if（something） 
 throw Exception; 
 else 
返回值; 
 

无法在if的else分支中返回值会导致编译错误，因为根据 something 的值，可能抛出或不抛出异常。

Is it in any way beneficial to return a value after throwing an exception? If not, can the return statement be left out and is it somehow possible to remove compiler error C4715: not all control paths return a value?

Thanks in advance.

Edit: (sample code)

for (ushort i = 0; i < itsNumUnits; ++i)
    if (unitFormation[i] == unit)
    {
        return unitSetup[i];
    }
    else
        throw unit;

return 0;

解决方案

There is no need to return a value after exception throw. If you have this error, you should check the paths your code can get to without throwing an exception, e.g.

if (something)
    throw Exception;
else
    return value;

Failing to return value in the "else" branch of "if" would cause a compile error because the exception may or may not be thrown depending on value of something.

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