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* [gcc r14-144] Add safe_is_a
@ 2023-04-21 13:53 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2023-04-21 13:53 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:2e047c00e983b6d9037906feac3a215ef829c82f
commit r14-144-g2e047c00e983b6d9037906feac3a215ef829c82f
Author: Richard Biener <rguenther@suse.de>
Date: Fri Apr 21 13:38:53 2023 +0200
Add safe_is_a
The following adds safe_is_a, an is_a check handling nullptr
gracefully.
* is-a.h (safe_is_a): New.
Diff:
---
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. */
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