c++ - How to avoid duplicate code -

as shown in pictures, 2 pieces of code same slight differences. each duplicate might create trouble, if encounter such situations, how supposed solve them?

example 1

example 2

it depends on case.

in general add function knows both ways , return value need in every case.

so in case like

bool myfuction(bool condition, int i, int k) {   if(condition == true)   {     return (i + min_size + k < ck_size);    }   else   {     return (i - min_size - k >= ck_size);   } } 

now can call myfunction(..)

the bool condition condition wether decide use first or second way.