What is run first inside a cout statement? (C++17)

Question

Say for example I have a long statement like

cout << findCurrent() << \",\" << findLowest() << \",\" << findHighest() << \

Answer 1

Before C++17, the order of evaluation is unspecified.

As of C++17, it's required to be evaluated left-to-right. See M.M's answer for standard quotation.