#include <memory>
#include <cstdint>

const uintptr_t ADDRESS{0x40};

struct RGB {
    uint8_t red{};
    uint8_t green{};
    uint8_t blue{};
}

class Color {
    std::unique_ptr<RGB> _rgb;

public:
    Color(uintptr_t address): _rgb{reinterpret_cast<RGB*>{address}} {}

    void set_red(uint8_t value) {
        _rgb->red = value;
    }
    void set_green(uint8_t value) {
        _rgb->green = value;
    }
    void set_blue(uint8_t value) {
        _rgb->blue = value;
    }
}

int main() {
    Color color{ADDRESS};
    color.set_red(255);
    color.set_green(127);
    color.set_blue(64);
    return 0;
}