RGB Class for Modern C++

rgb.cpp

#include <iostream>
#include <string>
#include <map>
#include <cxxabi.h>

class RGB {
public:
    using value_type = std::tuple<unsigned, unsigned, unsigned>;

    RGB(unsigned r, unsigned g, unsigned b) : m_r(r), m_g(g), m_b(b) {}

    [[nodiscard]] value_type rgb() const {return {m_r, m_g, m_b};}

    value_type operator()() const {return rgb();}

private:
    unsigned m_r = 0;
    unsigned m_g = 0;
    unsigned m_b = 0;
};

int main() {
    auto red = RGB(255, 0, 0);
    auto [r, g, b] = red.rgb();

    std::cout << "red r: " << r << " g: " << g << " b: " << b << std::endl;

    std::map<std::string, RGB> rgbs;
    rgbs["red"] = red;
    rgbs["blue"] = RGB(0, 0, 255);
    rgbs["green"] = RGB(0, 255, 0);

    int status = 0;
    for (auto& rgb: rgbs) {
        std::cout << abi::__cxa_demangle(typeid(rgb).name(), 0, 0, &status)<< std::endl;
    }

    for (auto& [name, rgb]: rgbs) {
        auto [r, g, b] = rgb.rgb();
        auto [r1, g1, b1] = rgb();

        std::cout << name << " r: " << r << " g: " << g << " b: " << b << std::endl;
        std::cout << name << " r: " << r1 << " g: " << g1 << " b: " << b1 << std::endl;
    }

    return 0;
}