(C++ : Design-pattern) Abstract Factory Pattern

#include <iostream>
using namespace std;

struct WinButton { void Draw() { cout << "Draw WinButton" << endl; }};
struct GTKButton { void Draw() { cout << "Draw GTKButton" << endl; }};

struct WinEdit { void Draw() { cout << "Draw WinEdit" << endl; }};
struct GTKEdit { void Draw() { cout << "Draw GTKEdit" << endl; }};

int main(int argv, char** argc)
{
    if(strcmp(argc[1], "Windows") == 0)
        ? pBtn = new WinButton;
    else
        ? pBtn = new GTKButton;
        // 공동의 기반클래스가 필요하다

    pBtn->Draw();
}

struct IEdit
{
    virtual void Draw() = 0;
    virtual ~IEdit() {}
};

struct IButton
{
    virtual void Draw() = 0;
    virtual ~IButton() {}
};

struct WinButton : public IButton { void Draw() { cout << "Draw WinButton" << endl; }};
struct GTKButton : public IButton { void Draw() { cout << "Draw GTKButton" << endl; }};

struct WinEdit : public IEdit { void Draw() { cout << "Draw WinEdit" << endl; }};
struct GTKEdit : public IEdit { void Draw() { cout << "Draw GTKEdit" << endl; }};

int main(int argv, char** argc)
{
    IButton * pBtn;
    if(strcmp(argc[1], "Windows") == 0)
        pBtn = new WinButton;
    else
        pBtn = new GTKButton;
        // 버튼이 추가될때마다 if문이 추가되어야하나?

    pBtn->Draw();
}

struct IFactory
{
    virtual IButton* CreateButton() = 0;
    virtual IEdit* CreateButton() = 0;
    virtual ~IFactory() {}
};

struct WinFactory : public IFactory
{
    WinButton* CreateButton() { return new WinButton; }
    WinEdit* CreateEdit() { return new WinEdit; }
};

struct GTKFactory : public IFactory
{
    GTKButton* CreateButton() { return new GTKButton; }
    GTKEdit* CreateEdit() { return new GTKEdit; }
};

int main(int argv, char** argc)
{
    * pFactory;
    if(strcmp(argc[1], "Windows") == 0)
        pFactory = new WinFactory;
    else
        pFactory = new GTKFactory;
  
    IButton* pBtn = pFactory->CreateButton();
    pBtn->Draw();
}