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>

5 files changed, 35 insertions, 0 deletions

diff --git a/src/corelib/tools/qlinkedlist.h b/src/corelib/tools/qlinkedlist.h
index 996a50fd1b..8970d39be0 100644
--- a/src/corelib/tools/qlinkedlist.h
+++ b/src/corelib/tools/qlinkedlist.h
@@ -275,6 +275,13 @@ private:
 template <typename T>
 Q_DECLARE_TYPEINFO_BODY(QLinkedList<T>, Q_MOVABLE_TYPE|Q_RELOCATABLE_TYPE);
 
+#if defined(__cpp_deduction_guides) && __cpp_deduction_guides >= 201606
+template <typename InputIterator,
+          typename ValueType = typename std::iterator_traits<InputIterator>::value_type,
+          QtPrivate::IfIsInputIterator<InputIterator> = true>
+QLinkedList(InputIterator, InputIterator) -> QLinkedList<ValueType>;
+#endif
+
 template <typename T>
 inline QLinkedList<T>::~QLinkedList()
 {
diff --git a/src/corelib/tools/qlist.h b/src/corelib/tools/qlist.h
index 70bbc11ad2..471e16886f 100644
--- a/src/corelib/tools/qlist.h
+++ b/src/corelib/tools/qlist.h
@@ -446,6 +446,13 @@ private:
     inline int count_impl(const T &, QListData::ArrayCompatibleLayout) const;
 };
 
+#if defined(__cpp_deduction_guides) && __cpp_deduction_guides >= 201606
+template <typename InputIterator,
+          typename ValueType = typename std::iterator_traits<InputIterator>::value_type,
+          QtPrivate::IfIsInputIterator<InputIterator> = true>
+QList(InputIterator, InputIterator) -> QList<ValueType>;
+#endif
+
 #if defined(Q_CC_BOR)
 template <typename T>
 Q_INLINE_TEMPLATE T &QList<T>::Node::t()
diff --git a/src/corelib/tools/qset.h b/src/corelib/tools/qset.h
index 19d6982133..2e72832185 100644
--- a/src/corelib/tools/qset.h
+++ b/src/corelib/tools/qset.h
@@ -269,6 +269,13 @@ private:
     }
 };
 
+#if defined(__cpp_deduction_guides) && __cpp_deduction_guides >= 201606
+template <typename InputIterator,
+          typename ValueType = typename std::iterator_traits<InputIterator>::value_type,
+          QtPrivate::IfIsInputIterator<InputIterator> = true>
+QSet(InputIterator, InputIterator) -> QSet<ValueType>;
+#endif
+
 template <typename T>
 uint qHash(const QSet<T> &key, uint seed = 0)
 noexcept(noexcept(qHashRangeCommutative(key.begin(), key.end(), seed)))
diff --git a/src/corelib/tools/qvarlengtharray.h b/src/corelib/tools/qvarlengtharray.h
index 2f62526076..253d05ba2b 100644
--- a/src/corelib/tools/qvarlengtharray.h
+++ b/src/corelib/tools/qvarlengtharray.h
@@ -265,6 +265,13 @@ private:
     }
 };
 
+#if defined(__cpp_deduction_guides) && __cpp_deduction_guides >= 201606
+template <typename InputIterator,
+          typename ValueType = typename std::iterator_traits<InputIterator>::value_type,
+          QtPrivate::IfIsInputIterator<InputIterator> = true>
+QVarLengthArray(InputIterator, InputIterator) -> QVarLengthArray<ValueType>;
+#endif
+
 template <class T, int Prealloc>
 Q_INLINE_TEMPLATE QVarLengthArray<T, Prealloc>::QVarLengthArray(int asize)
     : s(asize) {
diff --git a/src/corelib/tools/qvector.h b/src/corelib/tools/qvector.h
index ebe6527d89..62fbdb4a2a 100644
--- a/src/corelib/tools/qvector.h
+++ b/src/corelib/tools/qvector.h
@@ -326,6 +326,13 @@ private:
     class AlignmentDummy { Data header; T array[1]; };
 };
 
+#if defined(__cpp_deduction_guides) && __cpp_deduction_guides >= 201606
+template <typename InputIterator,
+          typename ValueType = typename std::iterator_traits<InputIterator>::value_type,
+          QtPrivate::IfIsInputIterator<InputIterator> = true>
+QVector(InputIterator, InputIterator) -> QVector<ValueType>;
+#endif
+
 #ifdef Q_CC_MSVC
 // behavior change: an object of POD type constructed with an initializer of the form ()
 // will be default-initialized