openframeworks/openFrameworks — comment on commit 1859bee20ca281f2f9f111e46c14a0b30e7096b9
File: libs/openFrameworks/math/ofTween.h line 38
By arturoc:

it's a typedef to the function pointer so later in ofMap the argument type can be specified as ofEasingFunction instead of the whole function pointer. also it'll make cleaner the autocomplete