How do I serialize and deserialize contents with std::map for large datasets?

Serializing and Deserializing std::map in C++

This guide demonstrates how to effectively serialize and deserialize large datasets stored in a std::map using JSON format.


// Example C++ code for serializing and deserializing std::map

#include 
#include 
#include 
#include 
#include  // Include your JSON library of choice

// Function to serialize std::map to JSON string
std::string serializeMap(const std::map<:string int>& myMap) {
    Json::Value jsonData;
    for (const auto& pair : myMap) {
        jsonData[pair.first] = pair.second;
    }
    Json::StreamWriterBuilder writer;
    return Json::writeString(writer, jsonData);
}

// Function to deserialize JSON string to std::map
std::map<:string int> deserializeMap(const std::string& jsonString) {
    std::map<:string int> myMap;
    Json::CharReaderBuilder reader;
    Json::Value jsonData;
    std::istringstream s(jsonString);
    std::string errs;

    if (Json::parseFromStream(reader, s, &jsonData, &errs)) {
        for (const auto& key : jsonData.getMemberNames()) {
            myMap[key] = jsonData[key].asInt();
        }
    }
    return myMap;
}

int main() {
    std::map<:string int> myMap = {{"apple", 1}, {"banana", 2}, {"cherry", 3}};
    
    // Serialize
    std::string jsonString = serializeMap(myMap);
    std::cout << "Serialized JSON: " << jsonString << std::endl;

    // Deserialize
    std::map<:string int> deserializedMap = deserializeMap(jsonString);
    for (const auto& pair : deserializedMap) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }

    return 0;
}

C++ std::map serialization deserialization large datasets JSON data storage

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