Some features from c++14 and 17 are used in order to create simpler and memory/performance optimized code.
Currently by default is used c++11 by default. Each time when used my libs, something like:
should be added.
For first look arduino framework has -std=c++11 by default.
As I understand, because avr-gcc supports lower version.
Tried on gcc 5.4.0: ~$ avr-gcc -std=c++17
and it passed.
Perhaps it can be a good time to increase c++ standard for arduino.
Or something is missed by me?