From e083d253950d3e7ce1e6363cd29fba416e69e371 Mon Sep 17 00:00:00 2001
From: Marc Mutz <marc.mutz@kdab.com>
Date: Fri, 20 Jul 2012 15:46:40 +0200
Subject: QMetaTypeId2::IsBuiltIn: (new) template meta-function to check for
 built-in types
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This allows to check whether QMetaTypeId2::MetaType exists, and can help
turn run-time into compile-time expressions, even without constexpr support,
or in situations where constexpr can't be used (because you can't overload
on it). This was designed for the QMetaType::registerConversion feature,
but it's much more widely applicable.

Change-Id: Iafa04add04bcb531b3f7fe3e751c7e91ee6a3bc0
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@nokia.com>
---
 tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'tests/auto/corelib/kernel')

diff --git a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
index 8247385b0d..b251761415 100644
--- a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
+++ b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
@@ -383,6 +383,25 @@ void tst_QMetaType::typeName()
     FOR_EACH_PRIMITIVE_METATYPE(F) \
     FOR_EACH_COMPLEX_CORE_METATYPE(F) \
 
+namespace {
+    template <typename T>
+    struct static_assert_trigger {
+        Q_STATIC_ASSERT(( QMetaTypeId2<T>::IsBuiltIn ));
+        enum { value = true };
+    };
+}
+
+#define CHECK_BUILTIN(MetaTypeName, MetaTypeId, RealType) static_assert_trigger< RealType >::value &&
+Q_STATIC_ASSERT(( FOR_EACH_CORE_METATYPE(CHECK_BUILTIN) true ));
+#undef CHECK_BUILTIN
+Q_STATIC_ASSERT(( QMetaTypeId2<QList<QVariant> >::IsBuiltIn));
+Q_STATIC_ASSERT(( QMetaTypeId2<QMap<QString,QVariant> >::IsBuiltIn));
+Q_STATIC_ASSERT(( QMetaTypeId2<QObject*>::IsBuiltIn));
+Q_STATIC_ASSERT((!QMetaTypeId2<tst_QMetaType*>::IsBuiltIn)); // QObject subclass
+Q_STATIC_ASSERT((!QMetaTypeId2<QList<int> >::IsBuiltIn));
+Q_STATIC_ASSERT((!QMetaTypeId2<QMap<int,int> >::IsBuiltIn));
+Q_STATIC_ASSERT((!QMetaTypeId2<QMetaType::Type>::IsBuiltIn));
+
 template <int ID>
 struct MetaEnumToType {};
 
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