我应该使用std :: cerr和exit（）而不是引发异常吗？ [英] Should I use std::cerr and exit() instead of throwing an exception?

问题描述

我对C ++比较陌生，我只是想知道，抛出异常或编写std :: cerr和exit（）之间的主要区别是什么？我知道，如果未捕获到异常，程序将退出。 std :: cerr是否有用例，还是应该始终抛出异常？还是我一般不应该使用std :: cerr？是否有一些最佳做法？

I'm relatively new to C++ and I am just wondering, what are the main differences between just throwing an exception or writing std::cerr and exit()? I know that if a exception isn't caught the program will exit. Are there any use cases for std::cerr or should I always throw exceptions? Or should I never use std::cerr in general? Are there some best practices for this?

throw std::runtime_error("runtime error msg");

OR

std::cerr << "cerr error msg";
exit(1);                      

两个版本都可以吗？

推荐答案

两者之间的主要区别是，您可以捕获和处理异常（通过 throw 引发）。此操作有两个优点：

The main difference between the two, is that you can catch and handle exception (raise with throw). There are two pros for this action:

A。您可以抛出异常并对其进行处理而不会导致程序崩溃。

A. You can throw an exception and handle it without crashing your program.

B。处理异常时，它们将自动调用对象的析构函数。例如：

B. When handling exception, they will automatically call the destructors of your objects. For example:

try {
    A a;
    throw runtime_error("A"); // Throw exception A
} catch (...) { // Catch exception A & Call a's object destructor.
    throw runtime_error("B"); // Throw exception B and crush (if no one else catch it).
}

您要使用掷球而不是 exit（1）选项。

有关更多详细信息，请参见：调用exit（）时析构函数是否运行？& 在C ++中抛出异常后是否会调用析构函数？

For more details please see: Are destructors run when calling exit()? & Are destructors called after a throw in C++?

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