1 files changed, 47 insertions, 0 deletions
diff --git a/graphs/cpp/smtptr/shared_pointer_is_a.cc b/graphs/cpp/smtptr/shared_pointer_is_a.cc
new file mode 100644
index 0000000..b6dcb95
--- /dev/null
+++ b/graphs/cpp/smtptr/shared_pointer_is_a.cc
@@ -0,0 +1,47 @@
+#include "shared_pointer.hh"
+
+class Animal
+{
+public:
+    virtual ~Animal()
+    {}
+};
+
+class Cat : public Animal
+{
+public:
+    void meow()
+    {
+        std::cout << "Meow!\n";
+    }
+};
+
+class Dog : public Animal
+{
+public:
+    void bark()
+    {
+        std::cout << "Woof!\n";
+    }
+};
+
+int main()
+{
+    SharedPointer<Animal> animalPtr{ new Cat };
+    if (animalPtr.is_a<Cat>())
+    { // true
+        std::cout << "The pointer points to a Cat.\n";
+    }
+
+    SharedPointer<Animal> animalPtr2{ new Dog };
+    if (animalPtr2.is_a<Cat>())
+    { // false
+        std::cout << "The pointer points to a Cat.\n";
+    }
+    else if (animalPtr2.is_a<Dog>())
+    {
+        std::cout << "The pointer points to a Dog.\n";
+    }
+
+    return 0;
+}