How do I serialize and deserialize std::variant in C++?

In C++, serializing and deserializing `std::variant` can be achieved by leveraging its type visitor capabilities along with JSON or other formats as per your requirement. This allows you to convert the variant to a serializable format and then back to its original state.

Example of Serializing and Deserializing std::variant


  #include 
  #include 
  #include 
  
  // Include a JSON library for serialization, e.g., nlohmann/json
  #include 

  using json = nlohmann::json;
  
  // Define a variant type
  using MyVariant = std::variant;
  
  // Function to serialize the variant
  json serialize(const MyVariant& v) {
      json j;
      std::visit([&](auto&& arg) {
          j = arg; // Overload based on the type in the variant
      }, v);
      return j;
  }
  
  // Function to deserialize the variant
  MyVariant deserialize(const json& j) {
      if (j.is_number_integer()) {
          return j.get();
      } else if (j.is_string()) {
          return j.get<:string>();
      } else if (j.is_number_float()) {
          return j.get();
      }
      throw std::invalid_argument("Unsupported type");
  }
  
  int main() {
      MyVariant v = std::string("Hello, world!");
      
      // Serialize
      json j = serialize(v);
      std::cout << "Serialized: " << j << std::endl;
      
      // Deserialize
      MyVariant newVariant = deserialize(j);
      std::visit([](auto&& val) { std::cout << "Deserialized: " << val << std::endl; }, newVariant);
      
      return 0;
  }

How do I serialize and deserialize std::variant in C++?

Example of Serializing and Deserializing std::variant

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How do I serialize and deserialize std::variant in C++?

Example of Serializing and Deserializing std::variant

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