From: arighi <arighi@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Thu, 23 Sep 2010 17:30:05 +0000 (+0000)
Subject: Introduce STATIC_ASSERT_EXPR()
X-Git-Tag: 2.6.0~124
X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=245f240a4720c5b2f582842a1cd773dafd8c9f97;p=bertos.git

Introduce STATIC_ASSERT_EXPR()

STATIC_ASSERT_EXPR() can be used to trigger compile time errors inside a
C expression.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4277 38d2e660-2303-0410-9eaa-f027e97ec537
---

diff --git a/bertos/cfg/compiler.h b/bertos/cfg/compiler.h
index e8a76ab1..8c217c00 100644
--- a/bertos/cfg/compiler.h
+++ b/bertos/cfg/compiler.h
@@ -580,6 +580,13 @@ typedef unsigned char sigmask_t; /**< Type for signal masks. */
 #define STATIC_ASSERT(condition)  \
 	UNUSED_VAR(extern char, STATIC_ASSERTION_FAILED__[(condition) ? 1 : -1])
 
+/**
+ * Issue a compilation error if \a __cond is false (this can be used inside an
+ * expression).
+ */
+#define STATIC_ASSERT_EXPR(__cond) \
+	(sizeof(struct { int STATIC_ASSERTION_FAILED__:!!(__cond); }) * 0)
+
 #ifndef ASSERT_TYPE_EQUAL
 	/** Ensure two variables have the same type. */
 	#define ASSERT_TYPE_EQUAL(var1, var2)  \