Function parameters that are fundamental types passed by value and const

The rule is to not do this in the header file. Some people say don't do it in the cpp file either (I am in that camp) but this does seem to be a matter of opinion. See the abseil article https://abseil.io/tips/109 for a discussion.

Windows, X11, cygwin, fonts and Xming

For years I used the X11 server that is part of cygwin. It seemed to be a bit flakey but there didn't seem to be anything better. Every now and then I would run into a problem where it would seem to work but xterm would complain about missing fonts. So, I downloaded and installed xming-fonts (from https://sourceforge.net/projects/xming/files/Xming-fonts/7.7.0.10/Xming-fonts-7-7-0-10-setup.exe/download) on my local node (not the node that was running xterm) and that fixed the error. These days I no longer use the cygwin X11. I use XMing: see http://www.straightrunning.com/XmingNotes.