Non-associative containers: add range constructors

Something nice we'd like to detect for array-backed containers
is if the iterator passed is a Contiguous one; if the type is also
trivially copyable / Q_PRIMITIVE_TYPE, we could memcpy() the whole
range.

However, there's no trait in the Standard to detect contiguous
iterators (the best approximation would be detecting if the iterator
is actually a pointer). Also, it's probably not smart to do the work
now for QVector since QVector needs refactoring anyhow, and this work
will be lost.

QString and QByteArray are left in another commit.

[ChangeLog][QtCore][QVector] Added range constructor.

[ChangeLog][QtCore][QVarLengthArray] Added range constructor.

[ChangeLog][QtCore][QList] Added range constructor.

[ChangeLog][QtCore][QStringList] Added range constructor.

[ChangeLog][QtCore][QLinkedList] Added range constructor.

[ChangeLog][QtCore][QSet] Added range constructor.

Change-Id: I220edb796053c9c4d31a6dbdc7efc5fc0f6678f9
Reviewed-by: Milian Wolff <milian.wolff@kdab.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/corelib/tools/qstringlist.h b/src/corelib/tools/qstringlist.h
index 6387161269..5ad01a0658 100644
--- a/src/corelib/tools/qstringlist.h
+++ b/src/corelib/tools/qstringlist.h
@@ -44,6 +44,7 @@
 #define QSTRINGLIST_H
 
 #include <QtCore/qalgorithms.h>
+#include <QtCore/qcontainertools_impl.h>
 #include <QtCore/qregexp.h>
 #include <QtCore/qstring.h>
 #include <QtCore/qstringmatcher.h>
@@ -109,6 +110,9 @@ public:
 #ifdef Q_COMPILER_INITIALIZER_LISTS
     inline QStringList(std::initializer_list<QString> args) : QList<QString>(args) { }
 #endif
+    template <typename InputIterator, QtPrivate::IfIsInputIterator<InputIterator> = true>
+    inline QStringList(InputIterator first, InputIterator last)
+        : QList<QString>(first, last) { }
 
     QStringList &operator=(const QList<QString> &other)
     { QList<QString>::operator=(other); return *this; }