From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 21 Sep 2023 10:25:25 +0000 (+0100)
Subject: macros.h: Implement side_enum_t
X-Git-Url: http://git.efficios.com/?p=libside.git;a=commitdiff_plain;h=f2a90e2a12b976abb0052229b5ce3f6163508a8f

macros.h: Implement side_enum_t

side_enum_t allows defining fixed-sized enumerations while preserving
typing information.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/include/side/macros.h b/include/side/macros.h
index 20fa97e..3915374 100644
--- a/include/side/macros.h
+++ b/include/side/macros.h
@@ -123,4 +123,24 @@
 
 #define SIDE_PTR_INIT(...)	{ .v = (uintptr_t) (__VA_ARGS__) }
 
+/*
+ * side_enum_t allows defining fixed-sized enumerations while preserving
+ * typing information.
+ */
+#define side_enum_t(_enum_type, _size_type)			\
+	union {							\
+		_size_type v;					\
+		_enum_type t[0];				\
+	}
+
+#define side_enum_get(_field)					\
+	((__typeof__((_field).t[0]))(_field).v)
+
+#define side_enum_set(_field, _v)				\
+	do {							\
+		(_field).v = (_v);				\
+	} while (0)
+
+#define SIDE_ENUM_INIT(...)	{ .v = (__VA_ARGS__) }
+
 #endif /* _SIDE_MACROS_H */