Writing with discipline is a synonym for writing castrated C++, to avoid touching language features not yet implemented or with slight semantic differences across compilers.

One of the things that attracted me to Java was that I finally could write something where I could use 100% of language features and actually use it everywhere.

C++17 is around the corner, yet most embedded, mainframe and commercial UNIX vendors are between C++11 and C++14, in the few cases where they already support anything from C++14.

Then there are the UB and implementation defined differences across those compilers.