Use the Functor instance defined on JCallee to reduce boilerplate.
Use the Functor instance defined on JCallee to reduce boilerplate.

bixuanzju/fcore,wxzh/fcore,bixuanzju/fcore,hkuplg/fcore,hkuplg/fcore,zhiyuanshi/fcore,wxzh/fcore,wxzh/fcore,xnning/fcore,zhiyuanshi/fcore,zhiyuanshi/fcore,bixuanzju/fcore,xnning/fcore,xnning/fcore,hkuplg/fcore