Merge pull request #552 from leapmotion/vdods-auto_arg-const-ptr

Deny T* as an AutoFilter argument.

autowiring/auto_arg.h

@@ -83,6 +83,29 @@ class auto_arg<std::shared_ptr<const T>>
   }
 };
 
+/// <summary>
+/// Specialization for "T*" ~ auto_in<T*>.  T must be const-qualified in order to be an input parameter.
+/// </summary>
+template<class T>
+class auto_arg<T*>
+{
+public:
+  static_assert(std::is_const<T>::value, "Pointer-typed input parameters must point to a const-qualified type (T must be const-qualified)");
+  typedef T* type;
+  typedef T* arg_type;
+  typedef auto_id<T*> id_type;
+  static const bool is_input = true;
+  static const bool is_output = false;
+  static const bool is_shared = false;
+  static const bool is_multi = false;
+  static const int tshift = 0;
+
+  template<class C>
+  static const T* arg(C& packet) {
+    return packet.template Get<const T*>();
+  }
+};
+
 /// <summary>
 /// Specialization for equivalent T auto_in<T>
 /// </summary>