The container list may accept another container.
For example a pair.

So we are trying to add pairs inside a list. It will become a list of pairs!

In the snippet below, I’m using only one file.
So just compile and execute it to see the result.

Let’s see this by creating a list of pairs in this tutorial.

The file

/* main.c */
#include <list>
#include <iostream>
#include <string>
class My {
    private:
    std::list < std::pair > _container;
    public:
    My() {
        std::cout << "My created." << std::endl;
        this->containerManager();
    }
    virtual ~My() {
        std::cout << "My destroyed." << std::endl;
    }
    void containerManager() {
        std::cout << "Size of _container = " << this->_container.size() << std::endl;
        this->containerAddElement(std::pair("John", "Gray"));
        this->containerAddElement(std::pair("William", "Blue"));
        this->containerAddElement(std::pair("Charles", "Green"));
        std::cout << "Size of _container = " << this->_container.size() << std::endl << std::endl;
        this->containerDisplayElements();
        this->containerUseFirstElement();
        this->containerDisplayElements();
        this->containerUseFirstElement();
        this->containerDisplayElements();
    }
    void containerAddElement(std::pair myPair) {
        std::cout << "Adding \"" << myPair.first << "\" and \"" << myPair.second << "\" in _container." << std::endl;
        this->_container.push_back(std::pair(myPair.first, myPair.second));
    }
    void containerDisplayElements() {
        int k;
        std::list < std::pair >::iterator it;
        k = 0;
        for (it = this->_container.begin(); it != this->_container.end(); ++it) {
            std::cout << "*it " << k << " = " << (*it).first << " - " << (*it).second << std::endl;
            ++k;
        }
        std::cout << "First element in _container = " << this->_container.front().first << " - " << this->_container.front().second << std::endl << std::endl;
    }
    void containerUseFirstElement() {
        std::cout << "Pop!" << std::endl;
        this->_container.pop_front();
    }
};
int main() {
    My *my = new My();
    delete my;
    while (1337);
    return 0;
}

Result

My created.
Size of _container = 0
Adding "John" and "Gray" in _container.
Adding "William" and "Blue" in _container.
Adding "Charles" and "Green" in _container.
Size of _container = 3
*it 0 = John - Gray
*it 1 = William - Blue
*it 2 = Charles - Green
First element in _container = John - Gray
Pop!
*it 0 = William - Blue
*it 1 = Charles - Green
First element in _container = William - Blue
Pop!
*it 0 = Charles - Green
First element in _container = Charles - Green
My destroyed.

Well done.