Report an error when passing a pointer to bindInstance(), instead of …

…reporting an obscure error later on.

See issue #25.

include/fruit/component.h

@@ -210,7 +210,13 @@ class PartialComponent {
    */
   template <typename AnnotatedType, typename C>
   PartialComponent<fruit::impl::BindInstance<AnnotatedType>, Bindings...> bindInstance(C& instance) &&;
-
+
+  // These deleted overloads are to prevent passing a pointer to bindInstance, you should pass a reference instead.
+  template <typename C>
+  void bindInstance(C* p) = delete;
+  template <typename AnnotatedType, typename C>
+  void bindInstance(C* p) = delete;
+
   /**
    * Registers `provider' as a provider of C, where provider is a lambda with no captures returning either C or C* (prefer
    * returning a C by value instead of allocating a C using `new C', to avoid the allocation).