C++:greater<int> and Less<int>

Greater and less are the two structures in Xfunctional.h, with the following code:

1template<class_ty =void>2     struct Less3{//functor for operator<4 typedef _ty First_argument_type;5 typedef _ty Second_argument_type;6typedefBOOLresult_type;7 8constexprBOOL operator()(Const_ty& _left,Const_ty& _right)Const9{//apply operator< to operandsTen         return(_left <_right); One         } A};

1template<class_ty =void>2     structGreater3{//functor for operator>4 typedef _ty First_argument_type;5 typedef _ty Second_argument_type;6typedefBOOLresult_type;7 8constexprBOOL operator()(Const_ty& _left,Const_ty& _right)Const9{//apply operator> to operandsTen         return(_left >_right); One         } A};

Greater indicates that the built-in types are sorted from large to small, less indicates built-in types from small to large.

C++:greater<int> and Less<int>