[Issue 15427] dynamic casting functions should be available in TypeInfo_Class

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15427

--- Comment #2 from Ketmar Dark <ketmar at ketmar.no-ip.org> ---
sample patch:

diff --git a/src/object.d b/src/object.d
index 097fc5a..6eb9163 100644
--- a/src/object.d
+++ b/src/object.d
@@ -21,6 +21,8 @@ private
 {
     extern (C) Object _d_newclass(const TypeInfo_Class ci);
     extern (C) void rt_finalize(void *data, bool det=true);
+    extern (C) void* _d_dynamic_cast(Object o, ClassInfo c);
+    extern (C) int _d_isbaseof(ClassInfo oc, ClassInfo c);
 }

 // NOTE: For some reason, this declaration method doesn't work
@@ -860,6 +862,17 @@ unittest
  */
 class TypeInfo_Class : TypeInfo
 {
+    final void* dynamicCast (Object o)
+    {
+        return (o !is null ? _d_dynamic_cast(o, this) : null);
+    }
+
+    // is this typeinfo base of `o`?
+    final bool baseOf (Object o)
+    {
+        return (o !is null ? (_d_isbaseof(typeid(o), this) != 0) : false);
+    }
+
     override string toString() const { return info.name; }

     override bool opEquals(Object o)

--