C / C++ / MFC

/*virtual*/void execute(int &num)
{
//  (receiver-> *action)(num);  //<-----
}

#include < iostream.h >
#include < vector >
using namespace std;
 
class Number
{
	public:
	void dubble(int &value)
	{
	value *= 2;
	}
};
 
class Command
	{
	public:
	virtual void execute(int &) = 0;
};
 
class SimpleCommand: public Command
{
	typedef void(Number:: *Action)(int &);
	Number *receiver;
	Action action;
	public:
	SimpleCommand(Number *rec, Action act)
	{
		receiver = rec;
		action = act;
	}
	/*virtual*/void execute(int &num)
	{
	//	(receiver-> *action)(num);
	}
};
 
class MacroCommand: public Command
{
	vector < Command * > list;
	public:
	void add(Command *cmd)
	{
		list.push_back(cmd);
	}
	/*virtual*/void execute(int &num)
	{
		for (int i = 0; i < list.size(); i++)
		list[i]->execute(num);
	}
};
 
int main()
{
	Number object;
	Command *commands[3];
	commands[0] = &SimpleCommand(&object, &Number::dubble);
 
	MacroCommand two;
	two.add(commands[0]);
	two.add(commands[0]);
	commands[1] = &two;
 
	MacroCommand four;
	four.add(&two);
	four.add(&two);
	commands[2] = &four;
 
	int num, index;
	while (true)
	{
		cout << "Enter number selection (0=2x 1=4x 2=16x): ";
		cin >> num >> index;
		commands[index]->execute(num);
		cout << " " << num << '\n';
	}

	return 0;
}

Falconapollo wrote:

/*virtual*/void execute(int &num)
{
    (receiver-> *action)(num);
}

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