#include <array>
#include <vector>
#include <map>
#include <iostream>
#include <functional>


template <typename T>
std::function<void(T&)> callback;


/*************************************************************************************************
 *
 */
class page {
public:
    page(int index, std::function<void()> func);
    void update_page(void);
    int get_index(void) { return index; };
private:
    int index;
    std::function<void()> function;
};

page::page(int index, std::function<void()> func)
{
    this->index = index;
    this->function = func;
}

void page::update_page(void)
{
    this->function();
}

/*************************************************************************************************
 *
 */
class the_sub {
public:
    the_sub();
    void add_page(int index, std::function<void()> func);
    void update(int index);
private:
    std::vector<page> pages;
};

the_sub::the_sub()
{

}

void the_sub::add_page(int index, std::function<void()> func)
{
    page tmp(index, func);
    pages.push_back(tmp);
}

void the_sub::update(int index)
{
    for (int i = 0; i < (int)pages.size(); i++)
    {
        if (pages.at(i).get_index() == i)
            pages.at(i).update_page();
    }
}

/*************************************************************************************************
 *
 */
class the_main : the_sub {
public:
    uint8_t myAger = 12;
    enum {MALE, FEMALE, DIVERS} sex;
    the_main();
    void print_something(void);
    void display_the_class_text(void);
    void add_the_page(int index);
    void the_update_func(void);
    void update(int index) { the_sub::update(index); };
private:

};

the_main::the_main(void) { }

void the_main::add_the_page(int index)
{
    //std::function<void(void)> t = std::bind(&the_main::display_the_class_text, this);
    add_page(index, std::bind(&the_main::display_the_class_text, this));
}

void the_main::print_something(void)
{
    std::cout << "something more " << std::endl;
}

void the_main::display_the_class_text(void)
{
    std::cout << "display the_main::text!" << std::endl;
    print_something();
}

/*************************************************************************************************
 *
 */

void xyz(void)
{
    std::cout << "display the text" << std::endl;
}

/*************************************************************************************************
 *
 */

int main(void)
{
    the_main tm;
    //callback t = (callback)&tm.display_the_class_text;
    tm.add_the_page(0);
    tm.update(0);

    std::cout << "main" << std::endl;

    return 0;
}