From 40d6e8adf5e3cc45b3bd4a94ad3b57f9444e447f Mon Sep 17 00:00:00 2001
From: Marc Mutz <marc.mutz@kdab.com>
Date: Wed, 1 Oct 2014 10:56:14 +0200
Subject: QList: prepare for tag dispatching based on memory layout

Add one tag class for each of QList's three different memory layouts
to QListData, and inherit QList<T>::MemoryLayout from exactly one of
them.

To simplify overloading, added tag classes that express the negation
of the two extreme poles of memory layout (C-compatible and heap),
too. The "missing" one could be added when needed, too.

Change-Id: I45ea603731499fd3fdfb37d60a0a98fb22ac15ec
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
---
 tests/auto/corelib/tools/qlist/tst_qlist.cpp | 32 ++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'tests/auto/corelib/tools/qlist/tst_qlist.cpp')

diff --git a/tests/auto/corelib/tools/qlist/tst_qlist.cpp b/tests/auto/corelib/tools/qlist/tst_qlist.cpp
index 95744051e4..1207986dde 100644
--- a/tests/auto/corelib/tools/qlist/tst_qlist.cpp
+++ b/tests/auto/corelib/tools/qlist/tst_qlist.cpp
@@ -35,6 +35,17 @@
 #include <QtTest/QtTest>
 #include <QList>
 
+template <typename T, class MemoryLayout>
+class is_qlist_array_memory_layout {
+    struct No { char c; };
+    struct Yes { No n[2]; };
+    Q_STATIC_ASSERT(sizeof(No) != sizeof(Yes));
+    static No check(...);
+    static Yes check(MemoryLayout);
+public:
+    enum { value = sizeof(check(typename QList<T>::MemoryLayout())) == sizeof(Yes) };
+};
+
 struct Movable {
     Movable(char input = 'j')
         : i(input)
@@ -235,6 +246,27 @@ Q_STATIC_ASSERT(!QTypeInfo<Optimal>::isStatic);
 Q_STATIC_ASSERT(QTypeInfo<Optimal>::isComplex);
 Q_STATIC_ASSERT(QTypeInfo<Complex>::isStatic);
 Q_STATIC_ASSERT(QTypeInfo<Complex>::isComplex);
+// iow:
+Q_STATIC_ASSERT(( is_qlist_array_memory_layout<int, QListData::NotIndirectLayout>       ::value));
+Q_STATIC_ASSERT((!is_qlist_array_memory_layout<int, QListData::IndirectLayout>          ::value));
+
+Q_STATIC_ASSERT((!is_qlist_array_memory_layout<Optimal, QListData::InlineWithPaddingLayout> ::value));
+Q_STATIC_ASSERT((!is_qlist_array_memory_layout<Optimal, QListData::NotArrayCompatibleLayout>::value));
+Q_STATIC_ASSERT(( is_qlist_array_memory_layout<Optimal, QListData::NotIndirectLayout>       ::value));
+Q_STATIC_ASSERT(( is_qlist_array_memory_layout<Optimal, QListData::ArrayCompatibleLayout>   ::value));
+Q_STATIC_ASSERT((!is_qlist_array_memory_layout<Optimal, QListData::IndirectLayout>          ::value));
+
+Q_STATIC_ASSERT(( is_qlist_array_memory_layout<Movable, QListData::InlineWithPaddingLayout> ::value));
+Q_STATIC_ASSERT(( is_qlist_array_memory_layout<Movable, QListData::NotArrayCompatibleLayout>::value));
+Q_STATIC_ASSERT(( is_qlist_array_memory_layout<Movable, QListData::NotIndirectLayout>       ::value));
+Q_STATIC_ASSERT((!is_qlist_array_memory_layout<Movable, QListData::ArrayCompatibleLayout>   ::value));
+Q_STATIC_ASSERT((!is_qlist_array_memory_layout<Movable, QListData::IndirectLayout>          ::value));
+
+Q_STATIC_ASSERT((!is_qlist_array_memory_layout<Complex, QListData::InlineWithPaddingLayout> ::value));
+Q_STATIC_ASSERT(( is_qlist_array_memory_layout<Complex, QListData::NotArrayCompatibleLayout>::value));
+Q_STATIC_ASSERT((!is_qlist_array_memory_layout<Complex, QListData::NotIndirectLayout>       ::value));
+Q_STATIC_ASSERT((!is_qlist_array_memory_layout<Complex, QListData::ArrayCompatibleLayout>   ::value));
+Q_STATIC_ASSERT(( is_qlist_array_memory_layout<Complex, QListData::IndirectLayout>          ::value));
 
 class tst_QList : public QObject
 {
-- 
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