在函数的签名中抛出关键字 [英] Throw keyword in function's signature

问题描述

如果函数或类方法抛出异常，那么在函数的签名中表示这是一个好习惯吗？请考虑：

If function or class method throws an exception, it is considered to be a good practice to signify this in the function's signature? Consider:

bool some_func() throw(myExc)
{
  ...
  if (problem_occurred) 
  {
    throw myExc("problem occurred");
  }
  ...
}

这个？这种编程风格的优点和缺点是什么？

Why should we do this? What are the advantages and disadvantages of such a programming style?

推荐答案

不，这不是好的做法。相反，它通常被认为是一个坏主意。

No, it is not considered good practice. On the contrary, it is generally considered a bad idea.

http ：//www.gotw.ca/publications/mill22.htm 有更多关于为什么的细节，但问题部分是编译器无法强制执行，所以它必须在运行时检查，这通常是不期望的。它在任何情况下都得不到很好的支持。 （MSVC忽略异常规范，除了throw（），它解释为不会抛出异常的保证。

http://www.gotw.ca/publications/mill22.htm goes into a lot more detail about why, but the problem is partly that the compiler is unable to enforce this, so it has to be checked at runtime, which is usually undesirable. And it is not well supported in any case. (MSVC ignores exception specifications, except throw(), which it interprets as a guarantee that no exception will be thrown.

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