C++ VC++；错误：数组实例化的大小来自模板化静态常量

以下代码在gcc上工作，但在VS2012上失败

class test_base{};

template<class DERIVED >
        class test_CRTP : public test_base
        {
                public:
                        const static int n_size;
        };

        //DEFAULT INITIALIZATION
template< class DERIVED >
        const int test_CRTP<DERIVED>::n_size = 3;

        //TEMPLATE SPECIALIZATION
        class test_spec : public test_CRTP<test_spec>{};


template<class test_T>
class MyClass{
public:
        void my_method(){
                int my_array[test_T::n_size];   //<-VS doesn't like this
        }
};

int main()
{
        MyClass<test_spec> oClass;
        oClass.my_method();
        return 0;
}

叮当声和gcc接受了这一点

MSVC对

常量static

的类外初始化不满意，将其移动到类内允许MSVC编译它。此问题出现在编译器（）的v19.00.23720.0中

模板
类测试CRTP：公共测试库{
公众：
const static int n_size=3；
//^^^^^将其移动到类中。
};

你可以在@Niall上试试，谢谢你的链接，看来我运气不好。因此无法重写静态常量成员变量：(

Compiled with  /EHsc /nologo /W4 /c
main.cpp
main.cpp(26): error C2131: expression did not evaluate to a constant
main.cpp(26): note: failure was caused by non-constant arguments or reference to a non-constant symbol
main.cpp(26): note: see usage of 'n_size'
main.cpp(25): note: while compiling class template member function 'void MyClass<test_spec>::my_method(void)'
main.cpp(33): note: see reference to function template instantiation 'void MyClass<test_spec>::my_method(void)' being compiled
main.cpp(32): note: see reference to class template instantiation 'MyClass<test_spec>' being compiled

template <class DERIVED>
class test_CRTP : public test_base {
 public:
  const static int n_size = 3;
  //                     ^^^^^ moved it into the class.
};