22 General utilities library [utilities]

22.10 Function objects [function.objects]

22.10.7 Arithmetic operations [arithmetic.operations]

22.10.7.1 General [arithmetic.operations.general]

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

22.10.7.2 Class template plus [arithmetic.operations.plus]

🔗

template<class T = void> struct plus {
  constexpr T operator()(const T& x, const T& y) const;
};

🔗

constexpr T operator()(const T& x, const T& y) const;

Returns: x + y.

🔗

template<> struct plus<void> {
  template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) + std::forward<U>(u));

  using is_transparent = unspecified;
};

🔗

template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) + std::forward<U>(u));

Returns: std::forward<T>(t) + std::forward(u).

22.10.7.3 Class template minus [arithmetic.operations.minus]

🔗

template<class T = void> struct minus {
  constexpr T operator()(const T& x, const T& y) const;
};

🔗

constexpr T operator()(const T& x, const T& y) const;

Returns: x - y.

🔗

template<> struct minus<void> {
  template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) - std::forward<U>(u));

  using is_transparent = unspecified;
};

🔗

template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) - std::forward<U>(u));

Returns: std::forward<T>(t) - std::forward(u).

22.10.7.4 Class template multiplies [arithmetic.operations.multiplies]

🔗

template<class T = void> struct multiplies {
  constexpr T operator()(const T& x, const T& y) const;
};

🔗

constexpr T operator()(const T& x, const T& y) const;

Returns: x * y.

🔗

template<> struct multiplies<void> {
  template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) * std::forward<U>(u));

  using is_transparent = unspecified;
};

🔗

template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) * std::forward<U>(u));

Returns: std::forward<T>(t) * std::forward(u).

22.10.7.5 Class template divides [arithmetic.operations.divides]

🔗

template<class T = void> struct divides {
  constexpr T operator()(const T& x, const T& y) const;
};

🔗

constexpr T operator()(const T& x, const T& y) const;

Returns: x / y.

🔗

template<> struct divides<void> {
  template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) / std::forward<U>(u));

  using is_transparent = unspecified;
};

🔗

template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) / std::forward<U>(u));

Returns: std::forward<T>(t) / std::forward(u).

22.10.7.6 Class template modulus [arithmetic.operations.modulus]

🔗

template<class T = void> struct modulus {
  constexpr T operator()(const T& x, const T& y) const;
};

🔗

constexpr T operator()(const T& x, const T& y) const;

Returns: x % y.

🔗

template<> struct modulus<void> {
  template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) % std::forward<U>(u));

  using is_transparent = unspecified;
};

🔗

template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
    -> decltype(std::forward<T>(t) % std::forward<U>(u));

Returns: std::forward<T>(t) % std::forward(u).

22.10.7.7 Class template negate [arithmetic.operations.negate]

🔗

template<class T = void> struct negate {
  constexpr T operator()(const T& x) const;
};

🔗

constexpr T operator()(const T& x) const;

Returns: -x.

🔗

template<> struct negate<void> {
  template<class T> constexpr auto operator()(T&& t) const
    -> decltype(-std::forward<T>(t));

  using is_transparent = unspecified;
};

🔗

template<class T> constexpr auto operator()(T&& t) const
    -> decltype(-std::forward<T>(t));

Returns: -std::forward<T>(t).