20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.6 Arithmetic operations [arithmetic.operations]

20.14.6.3 Class template multiplies [arithmetic.operations.multiplies]

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

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

Returns: x * y.

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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;
};

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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>(u).