C ++异常 - 是否抛出c字符串作为异常？ [英] C++ Exceptions - Is throwing c-string as an exception bad?

问题描述

我正在开发一个小型的c ++程序和学习异常。下面的代码是否坏，如果是，我该怎么做才能改善呢？

I am working on a small c++ program and learning exceptions. Is the following code "bad", and if so, what can I do to improve it?

try {
    // code
    if (some error) {
        throw "Description of error.";
    }
}
catch (char* errorMessage) {
    cerr << errorMessage << endl << "Fatal error";
}

抛出 code>数组作为例外？

Is there anything wrong with throwing a char array as an exception?

编辑：
这将是一个更好的方式吗？

Would this be a better way to go?

const char errorMessage[] = "Description of error";

try {
    // code
    if (some error) {
        throw errorMessage;
    }
}
catch (char* errorMessage) {
   cerr << errorMessage << endl << "Fatal error";
}

推荐答案

一个标准异常对象。一般来说，最佳实践是抛出从 std :: exception 派生的东西，这样，如果在某些情况下它确实导致你的程序终止，实现有更好的机会打印一个有用的诊断。

It is much better to throw a standard exception object. In general, the best practice is to throw something derived from std::exception so that if in some situation it does cause your program to terminate, the implementation has a better chance of printing a useful diagnostic.

因为这不难做，我不会建议抛出一个原始的字符串文字。

Because it isn't hard to do this, I would never recommend throwing a raw string literal.

#include <stdexcept>

void someFunction()
{
    try {
        // code
        if (some error) {
            throw std::runtime_error( "Description of error." );
        }
    }
    catch (const std::exception& ex) {
        std::cerr << ex.what() << "\nFatal error" << std::endl;
    }
}

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