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

Serialization and deserialization of `std::any` in C++ can be achieved by utilizing a combination of type information and stream manipulation. The `std::any` type allows you to store values of any type and can be serialized and deserialized by extracting the contained value and converting it to a format suitable for storage, such as JSON or binary.

Below is an example of how to serialize and deserialize `std::any` using JSON as the intermediary format. For this example, we'll use the `nlohmann/json` library for ease of JSON manipulation.


    #include 
    #include 
    #include 
    
    // Using nlohmann::json for serialization and deserialization
    using json = nlohmann::json;

    // Function to serialize std::any
    json serialize(const std::any& data) {
        if (data.type() == typeid(int)) {
            return json{ {"type", "int"}, {"value", std::any_cast(data)} };
        } else if (data.type() == typeid(double)) {
            return json{ {"type", "double"}, {"value", std::any_cast(data)} };
        } else if (data.type() == typeid(std::string)) {
            return json{ {"type", "string"}, {"value", std::any_cast<:string>(data)} };
        }
        throw std::runtime_error("Unsupported type");
    }

    // Function to deserialize std::any from json
    std::any deserialize(const json& j) {
        std::string type = j.at("type");
        if (type == "int") {
            return j.at("value").get();
        } else if (type == "double") {
            return j.at("value").get();
        } else if (type == "string") {
            return j.at("value").get<:string>();
        }
        throw std::runtime_error("Unsupported type");
    }

    int main() {
        std::any myData = 42;  // Can be int, double or std::string

        // Serialization
        json serializedData = serialize(myData);
        std::cout << "Serialized: " << serializedData.dump() << std::endl;

        // Deserialization
        std::any deserializedData = deserialize(serializedData);
        std::cout << "Deserialized Value: " << std::any_cast(deserializedData) << std::endl;

        return 0;
    }

C++ std::any serialization deserialization JSON nlohmann/json

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

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

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