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archive/design pattern/facade.cpp

@@ -0,0 +1,79 @@
+#include <iostream>
+using namespace std;
+
+class A
+{
+public:
+    void printA()
+    {
+        cout << "A\n";
+    }
+};
+
+class B
+{
+public:
+    void printB()
+    {
+        cout << "B\n";
+    }
+};
+
+class C
+{
+public:
+    void printC()
+    {
+        cout << "C\n";
+    }
+};
+
+class AbstractSystemFacade
+{
+public:
+    virtual void Func() = 0;
+};
+
+class ABFacade : public AbstractSystemFacade
+{
+    A *a;
+    B *b;
+
+public:
+    ABFacade()
+    {
+        a = new A();
+        b = new B();
+    }
+    void Func()
+    {
+        a->printA();
+        b->printB();
+    }
+};
+class ACFacade : public AbstractSystemFacade
+{
+    A *a;
+    C *c;
+
+public:
+    ACFacade()
+    {
+        a = new A();
+        c = new C();
+    }
+    void Func()
+    {
+        a->printA();
+        c->printC();
+    }
+};
+
+int main()
+{
+    AbstractSystemFacade *f = new ABFacade();
+    f->Func();
+    f=new ACFacade();
+    f->Func();
+    return 0;
+}