[comparisons.greater]

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

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

Returns: x > y.

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template<> struct greater<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).

22 General utilities library [utilities]

22.10 Function objects [function.objects]

22.10.8 Comparisons [comparisons]

22.10.8.4 Class template greater [comparisons.greater]