The following adds safe_is_a, an is_a check handling nullptr
gracefully.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
* is-a.h (safe_is_a): New.
---
gcc/is-a.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/gcc/is-a.h b/gcc/is-a.h
index b5355242655..0a697cf002a 100644
--- a/gcc/is-a.h
+++ b/gcc/is-a.h
@@ -232,6 +232,19 @@ is_a (U *p)
return is_a_helper<T>::test (p);
}
+/* Similar to is_a<>, but where the pointer can be NULL, even if
+ is_a_helper<T> doesn't check for NULL. */
+
+template <typename T, typename U>
+inline bool
+safe_is_a (U *p)
+{
+ if (p)
+ return is_a_helper <T>::test (p);
+ else
+ return false;
+}
+
/* A generic conversion from a base type U to a derived type T. See the
discussion above for when to use this function. */
--
2.35.3
