Interfaces

Author: Ohjurot

08_CatsAndDogs/08_CatsAndDogs.vcxproj

@@ -157,7 +157,9 @@
   <ItemGroup>
     <ClInclude Include="Cat.hpp" />
     <ClInclude Include="Dog.hpp" />
+    <ClInclude Include="IInteractable.hpp" />
     <ClInclude Include="Pet.hpp" />
+    <ClInclude Include="Toy.hpp" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

08_CatsAndDogs/08_CatsAndDogs.vcxproj.filters

@@ -32,5 +32,11 @@
     <ClInclude Include="Dog.hpp">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="IInteractable.hpp">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="Toy.hpp">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>

08_CatsAndDogs/Cat.hpp

@@ -4,7 +4,9 @@
 
 namespace PetManager
 {
-    class Cat : public Pet
+    class Cat : 
+        public Pet, 
+        public Pet::ToyInteractable
     {
         public:
             using Pet::Pet;
@@ -13,5 +15,17 @@ namespace PetManager
             {
                 return "Cat";
             }
+
+            std::string Interact(Toy& toy) override
+            {
+                if (dynamic_cast<ToyMouse*>(&toy))
+                {
+                    return "Jump!";
+                }
+                else
+                {
+                    return "Looks confused...";
+                }
+            }
     };
 }

08_CatsAndDogs/Dog.hpp

@@ -4,7 +4,9 @@
 
 namespace PetManager
 {
-    class Dog : public Pet
+    class Dog : 
+        public Pet, 
+        public Pet::ToyInteractable
     {
         public:
             using Pet::Pet;
@@ -13,5 +15,19 @@ namespace PetManager
             {
                 return "Dog";
             }
+
+            std::string Interact(Toy& toy) override
+            {
+                if (dynamic_cast<ToyMouse*>(&toy))
+                {
+                    return "Barks!";
+                }
+                else if (dynamic_cast<ToyBone*>(&toy))
+                {
+                    return "Chewing...";
+                }
+                
+                return "Looks confused...";
+            }
     };
 }

08_CatsAndDogs/IInteractable.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <string>
+
+namespace PetManager
+{
+    template<typename Return, typename... Args>
+    class IInteractable
+    {
+        public:
+            virtual ~IInteractable() = default;
+
+            virtual Return Interact(Args... args) = 0;
+    };
+}

08_CatsAndDogs/Pet.hpp

@@ -1,5 +1,8 @@
 #pragma once
 
+#include "Toy.hpp"
+#include "IInteractable.hpp"
+
 #include <string>
 #include <ostream>
 #include <string_view>
@@ -11,6 +14,10 @@ namespace PetManager
 {
     class Pet
     {
+        public:
+            using ToyInteractable = IInteractable<std::string, Toy&>;
+            using WaterInteractable = IInteractable<std::string, float /* Water speed */, float /* Water depth */>;
+
         public:
             Pet(const std::string_view& name);
             virtual ~Pet() = default;

08_CatsAndDogs/Toy.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+namespace PetManager
+{
+    struct Toy
+    {
+        virtual ~Toy() = default;
+
+        float apeal = 1.0f;
+    };
+
+    struct ToyBone : Toy
+    {
+        float durability = 3.0f;
+    };
+
+    struct ToyMouse : Toy
+    {
+        float durability = 1.5f;
+    };
+}

08_CatsAndDogs/main.cpp

@@ -10,6 +10,16 @@ int main()
     Cat tabby("Tabby");
     Dog oscar("Oscar");
 
+    ToyBone bone;
+    ToyMouse mouse;
+
+    std::cout << "Playing with our pets: " << std::endl;
+    std::cout << oscar.GetName() << " gets the bone: " << oscar.Interact(bone) << std::endl;
+    std::cout << oscar.GetName() << " gets the mouse: " << oscar.Interact(mouse) << std::endl;
+    std::cout << tabby.GetName() << " gets the bone: " << tabby.Interact(bone) << std::endl;
+    std::cout << tabby.GetName() << " gets the mouse: " << tabby.Interact(mouse) << std::endl;
+    std::cout << std::endl;
+
     tabby.Lived(); oscar.Lived();
     tabby.Lived(); oscar.Lived();
     tabby.Lived(); oscar.Lived();