How to create a List of Dictionaries in C++

How to create a List of Dictionaries in C++ ?

Answer

In C++, you can create a list of dictionaries using the `std::list` container for the outer list and `std::map` container for the inner dictionaries.

✐ Examples

1 Create List of Dictionaries

In this example,

We include the necessary header files for list and map.
We create two inner dictionaries named dict1 and dict2 using the std::map container.
We create an outer list named list_of_dicts using the std::list container and initialize it with the inner dictionaries.
Finally, we iterate through the list of dictionaries and print each dictionary to standard output.

C++ Program

#include <iostream>
#include <list>
#include <map>

int main() {
    std::map<std::string, std::string> dict1 = { {"key1", "value1"}, {"key2", "value2"} };
    std::map<std::string, std::string> dict2 = { {"key3", "value3"}, {"key4", "value4"} };
    std::list<std::map<std::string, std::string>> list_of_dicts = {dict1, dict2};

    for (const auto& dict : list_of_dicts) {
        for (const auto& pair : dict) {
            std::cout << pair.first << "=" << pair.second << " ";
        }
        std::cout << std::endl;
    }
    return 0;
}

Output

key1=value1 key2=value2 
key3=value3 key4=value4

2 Create List of Dictionaries with Empty Inner Dictionaries

In this example,

We create an empty outer list named list_of_dicts_empty using the std::list container.
We create two empty inner dictionaries named dict3 and dict4 using the std::map container.
We use the push_back method to add the inner dictionaries dict3 and dict4 to the outer list list_of_dicts_empty.
Finally, we iterate through the list of dictionaries with empty inner dictionaries and print each dictionary to standard output.

C++ Program

#include <iostream>
#include <list>
#include <map>

int main() {
    std::list<std::map<std::string, std::string>> list_of_dicts_empty;

    std::map<std::string, std::string> dict3;
    std::map<std::string, std::string> dict4;

    list_of_dicts_empty.push_back(dict3);
    list_of_dicts_empty.push_back(dict4);

    for (const auto& dict : list_of_dicts_empty) {
        for (const auto& pair : dict) {
            std::cout << pair.first << "=" << pair.second << " ";
        }
        std::cout << std::endl;
    }
    return 0;
}

Output

Summary

In this tutorial, we learned How to create a List of Dictionaries in C++ language with well detailed examples.

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How to create a List of Dictionaries in C++

How to create a List of Dictionaries in C++ ?

Answer

✐ Examples

1 Create List of Dictionaries

C++ Program

Output

2 Create List of Dictionaries with Empty Inner Dictionaries

C++ Program

Output

Summary

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