如何在Visual Studio中处理noexcept [英] How to deal with noexcept in Visual Studio

问题描述

我试图创建一个自定义异常，派生自 std :: exception 并覆盖 what（） 。起初，我写的是这样：

I'm trying to create a custom exception that derives from std::exception and overrides what(). At first, I wrote it like this:

class UserException : public std::exception
{
private:
    const std::string message;
public:
    UserException(const std::string &message)
        : message(message)
    {}

    virtual const char* what() const override
    {
        return message.c_str();
    }
};

这在VS2012中可以正常工作，但它不能在GCC 4.8中用 -std = c ++ 11 ：

This works fine in VS2012, but it doesn't compile in GCC 4.8 with -std=c++11:

错误：looser throw说明符'virtual const char * UserException :: what（）const'

error: looser throw specifier for ‘virtual const char* UserException::what() const’

所以我添加 noexcept p>

So I add noexcept:

virtual const char* what() const noexcept override

这在GCC中工作正常，但它不能在Visual Studio中编译（因为VS 2012不支持 noexcept ）：

This works fine in GCC, but it doesn't compile in Visual Studio (because VS 2012 doesn't support noexcept):

错误C3646：'noexcept'：未知的覆盖说明符

error C3646: 'noexcept' : unknown override specifier

什么是处理这个的推荐方法？我想使用两个编译器编译相同的代码，我使用C ++ 11功能，所以我不能用不同的 -std 编译。

What is the recommended way to deal with this? I want the same code to compile with both compilers and I'm using C++11 features, so I can't compile with different -std.

推荐答案

使用宏

#ifndef _MSC_VER
#define NOEXCEPT noexcept
#else
#define NOEXCEPT
#endif

然后将函数定义为

virtual const char* what() const NOEXCEPT override

您也可以修改，以允许 noexcept VS通过检查 _MSC_VER 的值;对于VS2012，值为1600.

You could also modify that to allow noexcept on later versions of VS by checking the value of _MSC_VER; for VS2012 the value is 1600.

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