Added bridge example source code.

examples/structural/bridge.cpp

@@ -0,0 +1,109 @@
+#include <string>
+#include <iostream>
+#include <memory>
+
+class Theme
+{
+  public:
+    typedef std::shared_ptr<Theme> ptr_t;
+    virtual std::string getColor(void) = 0;
+};
+
+class WebPage
+{
+  public:
+    virtual std::string getContent(void) = 0;
+};
+
+class About : public WebPage
+{
+  public:
+    About(Theme::ptr_t theme)
+        : theme_(theme)
+    {
+    }
+
+    std::string getContent(void)
+    {
+      return "About page in " + theme_->getColor();
+    }
+
+  private:
+    Theme::ptr_t theme_;
+};
+
+class Projects : public WebPage
+{
+  public:
+    Projects(Theme::ptr_t theme)
+        : theme_(theme)
+    {
+    }
+
+    std::string getContent(void)
+    {
+      return "Projects page in " + theme_->getColor();
+    }
+
+  private:
+    Theme::ptr_t theme_;
+};
+
+
+class Careers : public WebPage
+{
+  public:
+    Careers(Theme::ptr_t theme)
+        : theme_(theme)
+    {
+    }
+
+    std::string getContent(void)
+    {
+      return "Careers page in " + theme_->getColor();
+    }
+
+  private:
+    Theme::ptr_t theme_;
+};
+
+class DarkTheme : public Theme
+{
+  public:
+    std::string getColor(void)
+    {
+      return "dark palette";
+    }
+};
+
+class LightTheme : public Theme
+{
+  public:
+    std::string getColor(void)
+    {
+      return "light palette";
+    }
+};
+
+class AquaTheme : public Theme
+{
+  public:
+    std::string getColor(void)
+    {
+      return "aqua palette";
+    }
+};
+
+int main()
+{
+  Theme::ptr_t darkTheme = std::make_shared<DarkTheme>();
+  About about(darkTheme);
+  Careers careers(darkTheme);
+
+  // Output: About page in dark palette
+  std::cout << about.getContent() << std::endl;
+  // Output: Careers page in dark palette
+  std::cout << careers.getContent() << std::endl;
+
+  return 0;
+}