The goal of this exercise is to appreciate the performance effect of the Return Value Optimization.
Open the program rvo.cpp. It
contains a slight variation of the make_vector function introduced in one of
the previous exercises.
Measure the time it takes to execute it, applying the following variations:
-
the result is returned from the function
-
the result is passed to the function as an output parameter (by reference or by pointer)
Is there any difference?
When can it make a difference?