小编SAb*_*shi的帖子

#include <iostream>
struct B {
public:
    static int const bsm1a{ 0xf };
};
int const B::bsm1a; // 1) Why is this NOT considered a redefinition?
                    // 2) What does this line actually do here?

int main()
{
    std::cout << "Hello World!\n";
}

#include <iostream>
struct B {
public:
    static int const bsm1a{ 0xf };
    static int const bsm1a; // Considered as a redefinition here and throws error C2086
};

int main()
{
    std::cout << "Hello World!\n";
}

我的问题（嵌入在代码中）：

1. 为什么这不被视为重新定义？
2. 这条线实际上在这里做什么？