Introduce templates to loop queries looking for singletons. Several loop queries look for a singleton by finding all instances and then returning whether there is 1 instance or not. This can be improved by stopping the search after 2 have been found. Introduce templates for these functions to special-case such usage. There is no intended functional change.

Introduce range based singleton searches for loop queries. Several loop queries look for a singleton by finding all instances and then returning whether there is 1 instance or not. This can be improved by stopping the search after 2 have been found. Introduce generic range based singleton searches that stop after finding a second value and use them for these loop queries. There is no intended functional change other than improved compile-time efficiency.

Introduce templates to loop queries looking for singletonsrange based singleton searches for loop queries. Several loop queries look for a singleton by finding all instances and then returning whether there is 1 instance or not. This can be improved by stopping the search after 2 have been found. Introduce templates forgeneric range these functions to special-case such usagebased singleton searches that stop after finding a second value and use them for these loop queries. There is no intended functional change other than improved compile-time efficiency.