22 General utilities library [utilities]

22.10 Function objects [function.objects]

22.10.6 Class template reference_wrapper [refwrap]

22.10.6.6 Comparisons [refwrap.comparisons]

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friend constexpr bool operator==(reference_wrapper x, reference_wrapper y);
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Constraints: The expression x.get() == y.get() is well-formed and its result is convertible to bool.
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Returns: x.get() == y.get().
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friend constexpr bool operator==(reference_wrapper x, const T& y);
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Constraints: The expression x.get() == y is well-formed and its result is convertible to bool.
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Returns: x.get() == y.
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friend constexpr bool operator==(reference_wrapper x, reference_wrapper<const T> y);
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Constraints: is_const_v<T> is false and the expression x.get() == y.get() is well-formed and its result is convertible to bool.
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Returns: x.get() == y.get().
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friend constexpr auto operator<=>(reference_wrapper x, reference_wrapper y);
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Constraints: The expression synth-three-way(x.get(), y.get()) is well-formed.
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Returns: synth-three-way(x.get(), y.get()).
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friend constexpr auto operator<=>(reference_wrapper x, const T& y);
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Constraints: The expression synth-three-way(x.get(), y) is well-formed.
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Returns: synth-three-way(x.get(), y).
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friend constexpr auto operator<=>(reference_wrapper x, reference_wrapper<const T> y);
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Constraints: is_const_v<T> is false.
The expression synth-three-way(x.get(), y.get()) is well-formed.
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Returns: synth-three-way(x.get(), y.get()).