Can any one please look at the below code (specifically the Command class and tell me what is the typedef void(Giant:: *Action)(); line doing and where is Action defined or declared?
Code:class Giant
{
public:
Giant()
{
m_id = s_next++;
}
void fee()
{
cout << m_id << "-fee ";
}
void phi()
{
cout << m_id << "-phi ";
}
void pheaux()
{
cout << m_id << "-pheaux ";
}
private:
int m_id;
static int s_next;
};
int Giant::s_next = 0;
class Command
{
public:
typedef void(Giant:: *Action)();
Command(Giant *object, Action method)
{
m_object = object;
m_method = method;
}
void execute()
{
(m_object-> *m_method)();
}
private:
Giant *m_object;
Action m_method;
};
template <typename T> class Queue
{
public:
Queue()
{
m_add = m_remove = 0;
}
void enque(T *c)
{
m_array[m_add] = c;
m_add = (m_add + 1) % SIZE;
}
T *deque()
{
int temp = m_remove;
m_remove = (m_remove + 1) % SIZE;
return m_array[temp];
}
private:
enum
{
SIZE = 8
};
T *m_array[SIZE];
int m_add, m_remove;
};
int main()
{
Queue que;
Command *input[] =
{
new Command(new Giant, &Giant::fee), new Command(new Giant, &Giant::phi),
new Command(new Giant, &Giant::pheaux), new Command(new Giant, &Giant
::fee), new Command(new Giant, &Giant::phi), new Command(new Giant,
&Giant::pheaux)
};
for (int i = 0; i < 6; i++)
que.enque(input[i]);
for (int i = 0; i < 6; i++)
que.deque()->execute();
cout << '\n';
}
