Make table member list attribute of CustomerAssignment #1
Description
Currently, CustomerAssignment::get_table_members works by generating a new set for the table members every time the function is called. Based on some quick profiling, this seems to be rather time consuming. Efficiency can be improved by returning const references to table member sets stored internally in CustomerAssignment, or other similar ideas.
In the worst case, this might require messing around with the internal implementation of the tables.