void do1();
void do2();
void do1_1();
void do1_2();
void do2_1();
void do2_2();

const int mainMenuSize = 2;
struct MenuItem mainMenu[mainMenuSize] = {
	{"do 1", do1},
	{"do 2", do2},
};

const int menu1Size = 2;
struct MenuItem menu1[menu1Size] = {
	{"do 1_1", do1_1},
	{"do 1_2", do1_2},
};

const int menu2Size = 2;
struct MenuItem menu2[menu2Size] = {
	{"do 2_1", do2_1},
	{"do 2_2", do2_2},
};

void do1()
{
	showMenu(menu1, menu1Size);
}

void do2()
{
	showMenu(menu2, menu2Size);
}

void do1_1()
{
	std::cout << " 1_1 " << std::endl;
}

void do1_2()
{
	std::cout << " 1_2 " << std::endl;
}

void do2_1()
{
	std::cout << " 2_1 " << std::endl;
}

void do2_2()
{
	std::cout << " 2_2 " << std::endl;
}