Replace the current license disclaimer in files by
a SPDX-License-Identifier.
Task-number: QTBUG-67283
Change-Id: I708fd1f9f2b73d60f57cc3568646929117825813
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
While a plain lambda callback lacks a lot of the features of a real
Qt signal/slot connection, there are plenty situations where the
plain callback is all that's needed. Have some benchmark for more
educated guesses on timings.
Change-Id: I0c1fdfd2fd352d75c2af66fd713806bf3dd2d135
Reviewed-by: Christian Stenger <christian.stenger@qt.io>