20 General utilities library [utilities]

20.8 Function objects [function.objects]

20.8.4 Arithmetic operations [arithmetic.operations]

The library provides basic function object classes for all of the arithmetic operators in the language ([expr.mul], [expr.add]).

template <class T> struct plus { T operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef T result_type; };

operator() returns x + y.

template <class T> struct minus { T operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef T result_type; };

operator() returns x - y.

template <class T> struct multiplies { T operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef T result_type; };

operator() returns x * y.

template <class T> struct divides { T operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef T result_type; };

operator() returns x / y.

template <class T> struct modulus { T operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef T result_type; };

operator() returns x % y.

template <class T> struct negate { T operator()(const T& x) const; typedef T argument_type; typedef T result_type; };

operator() returns -x.