public static < T1 , T2 , R > BiFunction < T1 , T2 , R > spy1st ( BiFunction < T1 , T2 , R > function , Box < T1 > param1 ) { return spy ( function , Box . < R > empty ( ) , param1 , Box . < T2 > empty ( ) ) ; }
Proxies a binary function spying for first parameter .