QVLA: Add operator= for initializer lists

Add a dedicated operator=(std::initializer_list) that
first resizes the QCLA, and then replaces the elements
one by one.

This should be usually faster than creating a temporary
QCLA and then copying it, except for the case where the
new array does not fit into the allocated stack - but this
is IMO nothing to optimize for.

Task-number: QTBUG-45041
Change-Id: I147d6d01186b1ca3c635b2c8365d8f6e638ce6fe
GPush-Base: 08de3113051e1289f0de0651ec5647c9ee6feb27
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/corelib/tools/qvarlengtharray.qdoc b/src/corelib/tools/qvarlengtharray.qdoc
index d1b87f381e..a2d4c55f7a 100644
--- a/src/corelib/tools/qvarlengtharray.qdoc
+++ b/src/corelib/tools/qvarlengtharray.qdoc
@@ -362,6 +362,15 @@
     Assigns \a other to this array and returns a reference to this array.
  */
 
+/*! \fn QVarLengthArray<T, Prealloc> &QVarLengthArray::operator=(std::initializer_list<T> list)
+    \since 5.5
+
+    Assigns the values of \a list to this array, and returns a reference to this array.
+
+    This constructor is only enabled if the compiler supports C++11 initializer
+    lists.
+*/
+
 /*! \fn QVarLengthArray::QVarLengthArray(const QVarLengthArray<T, Prealloc> &other)
     Constructs a copy of \a other.
  */