c++ - Eclipse autocomplete not working for variables within classes -

for reason eclipse ide (oxygen 4.7.0) not giving autocomplete options variables within classes on c/c++ projects. works fine java projects.

so variable outside class autocompleted anywhere in code variable (or function) within class (i.e. classinstance.foo) not autocompleted unless typing within class constructor. box saying "no default proposals".

is there can fix behavior? i've tried cleaning , restarting. can't see change in autocomplete settings c/c++.