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archive/design pattern/decorator.cpp

@@ -0,0 +1,69 @@
+#include <iostream>
+using namespace std;
+
+class text
+{
+public:
+    virtual void display() = 0;
+};
+
+class original : public text
+{
+public:
+    void display()
+    {
+        cout << "简单加密\n";
+    }
+};
+
+class encrypt : public text
+{
+protected:
+    text *t;
+
+public:
+    encrypt(text *t)
+    {
+        this->t = t;
+    }
+    void display()
+    {
+        t->display();
+    }
+};
+
+class rsa : public encrypt
+{
+public:
+    rsa(text *t) : encrypt(t)
+    {
+    }
+    void display()
+    {
+        encrypt::display();
+        cout << "rsa加密\n";
+    }
+};
+
+class bit : public encrypt
+{
+public:
+    bit(text *t) : encrypt(t)
+    {
+    }
+    void display()
+    {
+        encrypt::display();
+        cout << "位加密\n";
+    }
+};
+
+int main()
+{
+    text *a, *b, *c;
+    a = new original();
+    b = new rsa(a);
+    c = new bit(b);
+    c->display();
+    return 0;
+}