X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Furcu%2Fcompiler.h;h=fb3c8f160dc580aa8ede55e1ad0fa525e5942ade;hb=20865c71e59536962252babe23c8ebdbd1cc28b0;hp=34eb564bb77795e9e77d21983240c3327b3401d1;hpb=220d1a7fc2af7d204a23b3fb9ece3fa7d9d8a518;p=userspace-rcu.git

diff --git a/include/urcu/compiler.h b/include/urcu/compiler.h
index 34eb564..fb3c8f1 100644
--- a/include/urcu/compiler.h
+++ b/include/urcu/compiler.h
@@ -119,4 +119,30 @@
 				+ __GNUC_PATCHLEVEL__)
 #endif
 
+#ifdef __cplusplus
+#define caa_unqual_scalar_typeof(x)					\
+	std::remove_cv<std::remove_reference<decltype(x)>::type>::type
+#else
+#define caa_scalar_type_to_expr(type)					\
+	unsigned type: (unsigned type)0,				\
+	signed type: (signed type)0
+
+/*
+ * Use C11 _Generic to express unqualified type from expression. This removes
+ * volatile qualifier from expression type.
+ */
+#define caa_unqual_scalar_typeof(x)					\
+	__typeof__(							\
+		_Generic((x),						\
+			char: (char)0,					\
+			caa_scalar_type_to_expr(char),			\
+			caa_scalar_type_to_expr(short),		\
+			caa_scalar_type_to_expr(int),			\
+			caa_scalar_type_to_expr(long),			\
+			caa_scalar_type_to_expr(long long),		\
+			default: (x)					\
+		)							\
+	)
+#endif
+
 #endif /* _URCU_COMPILER_H */