From 247ab241c783f776489d8bc348a84cb533079241 Mon Sep 17 00:00:00 2001
From: Marc Mutz <marc.mutz@kdab.com>
Date: Sun, 28 Jul 2019 14:43:24 +0300
Subject: QVector/QList/QLinkedList/QVarLengthArray/QSet: add missing deduction
 guides

Amends 2e1763d83a1dacfc5b747934fb77fa7cec7bfe47.

The new range ctors need deduction guides, since the compiler can't
deduce the value_type from a pair of iterators.

Change-Id: I3ec1e5f91305b317c443b6a70246be416b55bad9
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
---
 .../corelib/tools/qlinkedlist/tst_qlinkedlist.cpp  | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'tests/auto/corelib/tools/qlinkedlist/tst_qlinkedlist.cpp')

diff --git a/tests/auto/corelib/tools/qlinkedlist/tst_qlinkedlist.cpp b/tests/auto/corelib/tools/qlinkedlist/tst_qlinkedlist.cpp
index deb3b68c5c..df42b5dea9 100644
--- a/tests/auto/corelib/tools/qlinkedlist/tst_qlinkedlist.cpp
+++ b/tests/auto/corelib/tools/qlinkedlist/tst_qlinkedlist.cpp
@@ -187,6 +187,7 @@ private slots:
     void countInt() const;
     void countMovable() const;
     void countComplex() const;
+    void cpp17ctad() const;
     void emptyInt() const;
     void emptyMovable() const;
     void emptyComplex() const;
@@ -594,6 +595,33 @@ void tst_QLinkedList::countComplex() const
     QCOMPARE(liveCount, Complex::getLiveCount());
 }
 
+void tst_QLinkedList::cpp17ctad() const
+{
+#ifdef __cpp_deduction_guides
+#define QVERIFY_IS_LIST_OF(obj, Type) \
+    QVERIFY2((std::is_same<decltype(obj), QLinkedList<Type>>::value), \
+             QMetaType::typeName(qMetaTypeId<decltype(obj)::value_type>()))
+#define CHECK(Type, One, Two, Three) \
+    do { \
+        const Type v[] = {One, Two, Three}; \
+        QLinkedList v1 = {One, Two, Three}; \
+        QVERIFY_IS_LIST_OF(v1, Type); \
+        QLinkedList v2(v1.begin(), v1.end()); \
+        QVERIFY_IS_LIST_OF(v2, Type); \
+        QLinkedList v3(std::begin(v), std::end(v)); \
+        QVERIFY_IS_LIST_OF(v3, Type); \
+    } while (false) \
+    /*end*/
+    CHECK(int, 1, 2, 3);
+    CHECK(double, 1.0, 2.0, 3.0);
+    CHECK(QString, QStringLiteral("one"), QStringLiteral("two"), QStringLiteral("three"));
+#undef QVERIFY_IS_LIST_OF
+#undef CHECK
+#else
+    QSKIP("This test requires C++17 Constructor Template Argument Deduction support enabled in the compiler.");
+#endif
+}
+
 template<typename T>
 void tst_QLinkedList::empty() const
 {
-- 
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