Using a function pointer as a unique_ptr's deleter type, and passing it in at runtime, makes the unique_ptr fat (two pointers large). To avoid this overhead, I

Using a function pointer as a unique_ptr's deleter type, and passing it in at runtime, makes the unique_ptr fat (two pointers large). To avoid this overhead, I prefer passing in a default-constructible type with an operator() deleter function, and not passing in a value into the unique_ptr constructor (https://github.com/nyanpasu64/qvgmsplit/blob/edcce6df391c15beb7d5db9c5d9275f853c87690/src/backend.cpp#L52-L63 https://github.com/nyanpasu64/qvgmsplit/blob/edcce6df391c15b...). A neat party trick is to use the decltype of a lambda (https://old.reddit.com/r/cpp/comments/rlvsq0/does_anybody_really_use_deleters/hpmg0k6/ https://old.reddit.com/r/cpp/comments/rlvsq0/does_anybody_re...).