From 663cd1771883e1e7ac9c1a0dc8b797601b59ba17 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C4=99drzej=20Nowacki?= <jedrzej.nowacki@nokia.com>
Date: Fri, 14 Oct 2011 12:58:54 +0200
Subject: Introduce Q_STATIC_ASSERT
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Example of message of failed assert (gcc 4.6, file tst_qglobal.cpp:300):
tst_qglobal.cpp:300:92: error: invalid application of ‘sizeof’
to incomplete type ‘QStaticAssertFailure<false>’

Change-Id: Ic1798094f718eaad388d754034115aafbbb6bd5e
Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
---
 src/corelib/global/qglobal.h | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/corelib/global/qglobal.h')

diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index 5f8e6be893..ee601859b7 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -1785,6 +1785,15 @@ Q_CORE_EXPORT void qt_assert_x(const char *where, const char *what, const char *
 #  endif
 #endif
 
+// Intentionally undefined
+template <bool Test> class QStaticAssertFailure;
+template <> class QStaticAssertFailure<true> {};
+
+#define Q_STATIC_ASSERT_PRIVATE_JOIN(A, B) Q_STATIC_ASSERT_PRIVATE_JOIN_IMPL(A, B)
+#define Q_STATIC_ASSERT_PRIVATE_JOIN_IMPL(A, B) A ## B
+#define Q_STATIC_ASSERT(...) \
+    enum {Q_STATIC_ASSERT_PRIVATE_JOIN(q_static_assert_result, __LINE__) = sizeof(QStaticAssertFailure<bool(__VA_ARGS__)>)}
+
 Q_CORE_EXPORT void qt_check_pointer(const char *, int);
 Q_CORE_EXPORT void qBadAlloc();
 
-- 
cgit v1.2.3