Function variant_example2

examples/src/json_traits_variant_examples.cpp:242–275

}

void variant_example2()
{
    using variant_type  = std::variant<int, double, bool, std::string, ns::Color>;

    std::vector<variant_type> vars = {100, 10.1, false, std::string("Hello World"), ns::Color::yellow};

    std::string buffer;
    jsoncons::encode_json_pretty(vars, buffer);

    std::cout << "(1)\n" << buffer << "\n\n";

    auto vars2 = jsoncons::decode_json<std::vector<variant_type>>(buffer);

    auto visitor = [](auto&& arg) {
            using T = std::decay_t<decltype(arg)>;
            if constexpr (std::is_same_v<T, int>)
                std::cout << "int " << arg << '\n';
            else if constexpr (std::is_same_v<T, double>)
                std::cout << "double " << arg << '\n';
            else if constexpr (std::is_same_v<T, bool>)
                std::cout << "bool " << arg << '\n';
            else if constexpr (std::is_same_v<T, std::string>)
                std::cout << "std::string " << arg << '\n';
            else if constexpr (std::is_same_v<T, ns::Color>)
                std::cout << "ns::Color " << arg << '\n';
        };

    std::cout << "(2)\n";
    for (const auto& item : vars2)
    {
        std::visit(visitor, item);
    }
    std::cout << "\n";
}

void variant_example3()
{