observer pattern

// ConsoleApplication16.cpp : 이 파일에는 'main' 함수가 포함됩니다. 거기서 프로그램 실행이 시작되고 종료됩니다.
//

#include "pch.h"
#include <iostream>
#include <vector>

using namespace std;

class Iobserver {
public:
	virtual void Update(int n) = 0;
};

class Column : public Iobserver{
public:
	void Update(int n) {
		cout << "Column : ";
		for (int i = 0; i < n; ++i)
		{
			cout << "!";
		}
		cout << endl;
	}
};

class Row : public Iobserver {
public:
	void Update(int n) {
		cout << "Row : ";
		for (int i = 0; i < n; ++i)
		{
			cout << ")";
		}
		cout << endl;
	}
};

class Table {
public:
	vector<Iobserver*> obs;
	void Add(Iobserver* p) { obs.push_back(p); }
	void Erase(Iobserver* p) { }
	void Edit() {
		while (true) {
			int data;
			cout << "Data를 넣으세요" << endl;
			cin >> data;
			for (int i = 0; i < obs.size(); ++i) {
				obs[i]->Update(data);
			}
		}
	}
};
int main()
{
	Table* pTable = new Table();
	Column* pColumn = new Column();
	Row* pRow = new Row();

	pTable->Add(pColumn);
	pTable->Add(pRow);
	pTable->Edit();

	if (pTable) delete pTable;
	if (pColumn) delete pColumn;
	if (pRow) delete pRow;
	pTable = nullptr;
	pColumn = nullptr;
	pRow = nullptr;
}