From b9a3f2e7e22e3757e863af102c20cc465e1cc02b Mon Sep 17 00:00:00 2001
From: Marc Chevrier <marc.chevrier@gmail.com>
Date: Sun, 12 Jan 2020 17:26:12 +0100
Subject: STL Support: enhance behavior of cm::dynamic_reference_cast

Ensure cm::dynamic_reference_cast has same behavior as dynamic_cast
on reference: raise std::bad_cast if dynamic_cast is not possible.
---
 Utilities/std/cmext/memory | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Utilities/std/cmext/memory b/Utilities/std/cmext/memory
index 540a3de..50e79df 100644
--- a/Utilities/std/cmext/memory
+++ b/Utilities/std/cmext/memory
@@ -6,6 +6,8 @@
 #ifndef cmext_memory
 #define cmext_memory
 
+#include <typeinfo>
+
 #include <cm/type_traits>
 
 namespace cm {
@@ -24,7 +26,13 @@ template <typename T, typename O,
             int> = 0>
 T& dynamic_reference_cast(O& item)
 {
-  return *(dynamic_cast<T*>(item.get()));
+  auto p = dynamic_cast<T*>(item.get());
+
+  if (p == nullptr) {
+    throw std::bad_cast();
+  }
+
+  return *p;
 }
 
 } // namespace cm
-- 
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