constexpr静态std :: array <const char *，5>无法使用MSVC2013进行编译

Question

我有以下代码：

#include <array>
#include <iostream>

class ExternalGeometryExtension
{
public:
    enum Flag {
        Defining = 0,
        Frozen = 1, 
        Detached = 2,
        Missing = 3,
        Sync = 4,
        NumFlags
    };

    constexpr static std::array<const char *,NumFlags> flag2str{{ "Defining", "Frozen", "Detached","Missing", "Sync" }};
};

int main()
{
    std::cout << ExternalGeometryExtension::flag2str[ExternalGeometryExtension::Frozen] << std::endl;
    return 0;
}

可以使用以下版本编译良好：clang版本5.0.0和gcc（Ubuntu 4.8.4-2ubuntu1〜14.04.3）4.8.4

无法使用MSVC2013进行编译。

编译错误是：

#include <array>
#include <iostream>

class ExternalGeometryExtension
{
public:
    enum Flag {
        Defining = 0,
        Frozen = 1, 
        Detached = 2,
        Missing = 3,
        Sync = 4,
        NumFlags
    };

    constexpr static std::array<const char *,NumFlags> flag2str{{ "Defining", "Frozen", "Detached","Missing", "Sync" }};
};

int main()
{
    std::cout << ExternalGeometryExtension::flag2str[ExternalGeometryExtension::Frozen] << std::endl;
    return 0;
}

完整的编译器输出在这里

我的问题是：我做错了什么？为什么不使用MSVC2013进行编译？

我可以做些什么使该代码与MSVC2013一起使用，而又不会在其他编译器中破坏它？

EDIT: I have changed the code so that it is a Minimal, Complete, and Verifiable example as requested by Toby Speight based on the good guess of Diodacus. I cannot produce the error output of that specific code, because I do not have a copy of MSVC2003. I work on an opensource, FreeCAD, which offers Windows support. I use Linux. In any case, the errors in the output correspond to the code I show. This is the output of the AppVeyor test before integration. The code passes the Linux CI fine. I am going to try to make the most of this question, hopping that it is useful for others.

EDIT 2: I have realised that the double bracket initialization has raised some eyebrows. From the example in cppreference:

在CWG 1270修订版之前的C ++ 11中需要双括号（修订版之后的C ++ 11中以及C ++ 14及更高版本中不需要）

没有双括号，gcc 4.8失败。

Answer 1

根据此Microsoft devblog的介绍，constexpr它是VS 2013不支持的C ++ 11核心语言功能之一。“ 2013年11月CTP”仅部分支持它。