This post isn’t about our favorite old school robot Johnny 5. So let’s start with the second part: the non defined order of evaluation of function parameters (yes, it’s non defined)
if(A(C()), B())
The compiler is free to evaluate A(), then B(), C(), or B(), then C(), then A(), etc. This could be troublesome if you expect a variable to be initialized in A() to be used in B(). The one guarantee is that C() is evaluated before A().
Another item which has some fun with the order of evaluations are the logical operators. Probably a bit of an “yeah, makes sense”, but worth the refresher.
operator || and operator && won’t necessarily evaluate all their arguments. This is known as “Short circuit evaluation”. For example:
Continue reading “Short circuits and the evaluation order of function parameters“