60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
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#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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namespace ns
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{
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enum TaskState
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{
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TS_STOPPED,
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TS_RUNNING,
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TS_COMPLETED,
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TS_INVALID = -1
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};
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NLOHMANN_JSON_SERIALIZE_ENUM(TaskState,
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{
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{ TS_INVALID, nullptr },
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{ TS_STOPPED, "stopped" },
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{ TS_RUNNING, "running" },
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{ TS_COMPLETED, "completed" }
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})
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enum class Color
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{
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red, green, blue, unknown
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};
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NLOHMANN_JSON_SERIALIZE_ENUM(Color,
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{
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{ Color::unknown, "unknown" }, { Color::red, "red" },
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{ Color::green, "green" }, { Color::blue, "blue" }
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})
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} // namespace ns
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int main()
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{
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// serialization
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json j_stopped = ns::TS_STOPPED;
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json j_red = ns::Color::red;
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std::cout << "ns::TS_STOPPED -> " << j_stopped
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<< ", ns::Color::red -> " << j_red << std::endl;
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// deserialization
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json j_running = "running";
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json j_blue = "blue";
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auto running = j_running.template get<ns::TaskState>();
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auto blue = j_blue.template get<ns::Color>();
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std::cout << j_running << " -> " << running
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<< ", " << j_blue << " -> " << static_cast<int>(blue) << std::endl;
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// deserializing undefined JSON value to enum
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// (where the first map entry above is the default)
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json j_pi = 3.14;
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auto invalid = j_pi.template get<ns::TaskState>();
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auto unknown = j_pi.template get<ns::Color>();
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std::cout << j_pi << " -> " << invalid << ", "
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<< j_pi << " -> " << static_cast<int>(unknown) << std::endl;
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}
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