Merge branch 'release-5.x' into develop

include/chaiscript/dispatchkit/boxed_cast_helper.hpp

@@ -173,6 +173,21 @@ namespace chaiscript
       {
       };
 
+    template<typename Result>
+      struct Cast_Helper_Inner<std::shared_ptr<Result> &>
+      {
+        static_assert(!std::is_const<Result>::value, "Non-const reference to std::shared_ptr<const T> is not supported");
+
+        typedef Boxed_Value::Sentinel<Result> Result_Type;
+
+        static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
+        {
+          std::shared_ptr<Result> &res = ob.get().cast<std::shared_ptr<Result> >();
+          return ob.pointer_sentinel(res);
+        }
+      };
+
+
     /// Cast_Helper_Inner for casting to a const std::shared_ptr<const> & type
     template<typename Result>
       struct Cast_Helper_Inner<const std::shared_ptr<const Result> > : Cast_Helper_Inner<std::shared_ptr<const Result> >

include/chaiscript/dispatchkit/boxed_value.hpp

@@ -226,6 +226,50 @@ namespace chaiscript
         return m_data->m_type_info.bare_equal(ti);
       }
 
+      template<typename T>
+      struct Sentinel {
+        Sentinel(std::shared_ptr<T> &ptr, Data &data)
+          : m_ptr(ptr), m_data(data)
+        {
+        }
+
+        ~Sentinel()
+        {
+          // save new pointer data
+          m_data.get().m_data_ptr = m_ptr.get().get();
+          m_data.get().m_const_data_ptr = m_ptr.get().get();
+        }
+
+        Sentinel& operator=(Sentinel&&s) {
+          m_ptr = std::move(s.m_ptr);
+          m_data = std::move(s.m_data);
+        }
+
+        Sentinel(Sentinel &&s)
+          : m_ptr(std::move(s.m_ptr)),
+            m_data(std::move(s.m_data))
+        {
+        }
+
+        operator std::shared_ptr<T>&() const
+        {
+          return m_ptr.get();
+        }
+
+        Sentinel &operator=(const Sentinel &) = delete;
+        Sentinel(Sentinel&) = delete;
+
+        std::reference_wrapper<std::shared_ptr<T>> m_ptr;
+        std::reference_wrapper<Data> m_data;
+      };
+
+
+      template<typename T>
+      Sentinel<T> pointer_sentinel(std::shared_ptr<T> &ptr) const
+      {
+        return Sentinel<T>(ptr, *(m_data.get()));
+      }
+
       bool is_null() const noexcept
       {
         return (m_data->m_data_ptr == nullptr && m_data->m_const_data_ptr == nullptr);

include/chaiscript/dispatchkit/type_info.hpp

@@ -150,6 +150,11 @@ namespace chaiscript
         }
       };
 
+    template<typename T>
+      struct Get_Type_Info<std::shared_ptr<T> &> : Get_Type_Info<std::shared_ptr<T>>
+      {
+      };
+
     template<typename T>
       struct Get_Type_Info<const std::shared_ptr<T> &>
       {