This is a combination of running clang-tidy with modernize-use-nullptr
check for some ports (GTK, X11, OSX) and manual changes to the ports for
which it couldn't be used easily (MSW, DFB) and also manually updating
the docs.
Also replace NULL with null or nullptr in the comments as this is more
consistent with the use of nullptr in the code and makes it simpler to
grep for the remaining occurrences of NULL itself.
And also use null in the assert messages.
Only a few occurrences of "NULL" are still left in non-C files, mostly
corresponding to unclear comments or string output which it might not be
safe to change.
Allow using wxZlib{Input,Output}Stream too, meaning that the sample can
now also work with .gz files, handling them as a degenerate (because
containing only a single file) special case of archives.
The changes here -- which should be viewed ignoring whitespace to be
actually readable -- don't modify the existing code and just add the
possibility to use a wxFilterClassFactory if there is no
wxArchiveClassFactory corresponding to the specified file extension.
This sample shows usage of wxArchiveStream and wxArchiveFactory.
It also allows for easy testing of wxArchiveStream implementations
outside of the unit tests.
See https://github.com/wxWidgets/wxWidgets/pull/730