Initial check in of support for upcasting during function invocation. No examples or tests are checked in yet. Some reorg was necessary to get things compiling in the right order. Is not currently thread safe and probably does not work properly across module boundaries

include/chaiscript/dispatchkit/boxed_cast.hpp

@@ -0,0 +1,53 @@
+// This file is distributed under the BSD License.
+// See "license.txt" for details.
+// Copyright 2009-2010, Jonathan Turner (jturner@minnow-lang.org)
+// and Jason Turner (lefticus@gmail.com)
+// http://www.chaiscript.com
+
+#ifndef __boxed_cast_hpp__
+#define __boxed_cast_hpp__
+
+#include "type_info.hpp"
+#include "boxed_value.hpp"
+#include "boxed_cast_helper.hpp"
+#include "dynamic_cast_conversion.hpp"
+
+#include "../chaiscript_threading.hpp"
+#include <boost/shared_ptr.hpp>
+#include <boost/any.hpp>
+#include <boost/function.hpp>
+#include <boost/ref.hpp>
+#include <boost/cstdint.hpp>
+#include <boost/type_traits/add_const.hpp>
+#include <boost/integer_traits.hpp>
+
+namespace chaiscript 
+{
+  
+  /**
+   * boxed_cast function for casting a Boxed_Value into a given type
+   * example:
+   * int &i = boxed_cast<int &>(boxedvalue);
+   */
+  template<typename Type>
+  typename detail::Cast_Helper<Type>::Result_Type boxed_cast(const Boxed_Value &bv)
+  {
+    try {
+      return detail::Cast_Helper<Type>::cast(bv);
+    } catch (const boost::bad_any_cast &) {
+      try {
+        // We will not catch any bad_boxed_dynamic_cast that is thrown, let the user get it
+        // either way, we are not responsible if it doesn't work
+        return detail::Cast_Helper<Type>::cast(boxed_dynamic_cast<Type>(bv));
+      } catch (const boost::bad_any_cast &) {
+        throw bad_boxed_cast(bv.get_type_info(), typeid(Type));
+      }
+    } 
+  }
+
+}
+
+
+
+#endif
+