Function variant_example

examples/src/json_traits_variant_examples.cpp:196–240

)

void variant_example()
{
    std::string input = R"(
{
  "owner": "Rodrigo",
  "items": [
    {
      "name": "banana",
      "color": "YELLOW"
    },
    {
      "size": 40,
      "material": "wool"
    },
    {
      "name": "apple",
      "color": "RED"
    },
    {
      "size": 40,
      "material": "cotton"
    }
  ]
}
    )";

    ns::Basket basket = jsoncons::decode_json<ns::Basket>(input);
    std::cout << basket.owner() << "\n\n";

    std::cout << "(1)\n";
    for (const auto& var : basket.items()) 
    {
        std::visit([](auto&& arg) {
            using T = std::decay_t<decltype(arg)>;
            if constexpr (std::is_same_v<T, ns::Fruit>)
                std::cout << "Fruit " << arg << '\n';
            else if constexpr (std::is_same_v<T, ns::Fabric>)
                std::cout << "Fabric " << arg << '\n';
        }, var);
    }

    std::string output;
    jsoncons::encode_json_pretty(basket, output);
    std::cout << "(2)\n" << output << "\n\n";
}

void variant_example2()
{