QSet: Document to/from QVector transformation techniques

Change-Id: I2a2ff6332bd6e8ed3d4ba7b4765da0a94a06f133
Fixes: QTBUG-71067
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

src/corelib/doc/snippets/code/doc_src_containers.cpp

@@ -312,3 +312,11 @@ int j = *i; // Undefined behavior!
     but with QVector this is likely to crash.
 */
 //! [24]
+
+//! [25]
+QVector<int> vector{1, 2, 3, 4, 4, 5};
+QSet<int> set(vector.begin(), vector.end());
+/*
+    Will generate a QSet containing 1, 2, 4, 5.
+*/
+//! [25]

src/corelib/doc/src/containers.qdoc

@@ -66,6 +66,12 @@
     Qt also offers a \l{foreach} keyword that make it very
     easy to iterate over all the items stored in a container.
 
+    \note Since Qt 5.14, range constructors are available for most of the
+    container classes. QMultiMap is a notable exception. Their use is
+    encouraged in place of the various from/to methods. For example:
+
+    \snippet code/doc_src_containers.cpp 25
+
     \section1 The Container Classes
 
     Qt provides the following sequential containers: QList,

src/corelib/doc/src/includes/containers-range-constructor.qdocinc

@@ -0,0 +1,2 @@
+    \note Since Qt 5.14, range constructors are available for Qt's generic
+    \l{container classes} and should be used in place of this method.

src/corelib/tools/qlist.cpp

@@ -2014,6 +2014,8 @@ void **QListData::erase(void **xi)
 
     \snippet code/src_corelib_tools_qlistdata.cpp 21
 
+    \include containers-range-constructor.qdocinc
+
     \sa fromSet(), toVector(), QVector::toList()
 */
 
@@ -2025,6 +2027,8 @@ void **QListData::erase(void **xi)
 
     \snippet code/src_corelib_tools_qlistdata.cpp 22
 
+    \include containers-range-constructor.qdocinc
+
     \sa toSet(), fromVector(), QVector::fromList()
 */
 
@@ -2037,6 +2041,8 @@ void **QListData::erase(void **xi)
 
     \snippet code/src_corelib_tools_qlistdata.cpp 23
 
+    \include containers-range-constructor.qdocinc
+
     \sa fromVector(), toSet(), QSet::toList()
 */
 
@@ -2050,6 +2056,8 @@ void **QListData::erase(void **xi)
 
     \snippet code/src_corelib_tools_qlistdata.cpp 24
 
+    \include containers-range-constructor.qdocinc
+
     \sa toVector(), fromSet(), QSet::fromList()
 */
 
@@ -2062,6 +2070,8 @@ void **QListData::erase(void **xi)
 
     \snippet code/src_corelib_tools_qlistdata.cpp 25
 
+    \include containers-range-constructor.qdocinc
+
     \sa toStdList(), QVector::fromStdVector()
 */
 
@@ -2072,6 +2082,8 @@ void **QListData::erase(void **xi)
 
     \snippet code/src_corelib_tools_qlistdata.cpp 26
 
+    \include containers-range-constructor.qdocinc
+
     \sa fromStdList(), QVector::toStdVector()
 */
 

src/corelib/tools/qset.qdoc

@@ -1001,6 +1001,8 @@
 
     \snippet code/doc_src_qset.cpp 13
 
+    \include containers-range-constructor.qdocinc
+
     \sa fromList(), QList::fromSet()
 */
 
@@ -1011,6 +1013,8 @@
 
     This is the same as toList().
 
+    \include containers-range-constructor.qdocinc
+
     \sa fromList(), QList::fromSet()
 */
 
@@ -1026,6 +1030,8 @@
 
     \snippet code/doc_src_qset.cpp 14
 
+    \include containers-range-constructor.qdocinc
+
     \sa toList(), QList::toSet()
 */
 

src/corelib/tools/qvector.qdoc

@@ -1359,6 +1359,8 @@
 
     \snippet code/src_corelib_tools_qvector.cpp 14
 
+    \include containers-range-constructor.qdocinc
+
     \sa fromList(), QList::fromVector()
 */
 
@@ -1370,6 +1372,8 @@
 
     \snippet code/src_corelib_tools_qvector.cpp 15
 
+    \include containers-range-constructor.qdocinc
+
     \sa toList(), QList::toVector()
 */
 
@@ -1382,6 +1386,8 @@
 
     \snippet code/src_corelib_tools_qvector.cpp 16
 
+    \include containers-range-constructor.qdocinc
+
     \sa toStdVector(), QList::fromStdList()
 */
 
@@ -1392,6 +1398,8 @@
 
     \snippet code/src_corelib_tools_qvector.cpp 17
 
+    \include containers-range-constructor.qdocinc
+
     \sa fromStdVector(), QList::toStdList()
 */