在C++中初始化位域结构的最佳方法是什么？

struct Color {
    unsigned char red : 8;
    unsigned char green : 8;
    unsigned char blue : 8;
};

struct Color {
    unsigned char red : 8;
    unsigned char green : 8;
    unsigned char blue : 8;

    Color(unsigned char r, unsigned char g, unsigned char b) : red(r), green(g), blue(b) {}
};

Color c(255, 0, 0); // 初始化一个红色的颜色值