23 Strings library [strings]

23.3 String view classes [string.view]

23.3.4 Non-member comparison functions [string.view.comparison]

template<class charT, class traits>
  constexpr bool operator==(basic_string_view<charT, traits> lhs,
                            type_identity_t<basic_string_view<charT, traits>> rhs) noexcept;

Returns: lhs.compare(rhs) == 0.

🔗

template<class charT, class traits>
  constexpr see below operator<=>(basic_string_view<charT, traits> lhs,
                                  type_identity_t<basic_string_view<charT, traits>> rhs) noexcept;

Let R denote the type traits::comparison_category if that qualified-id is valid and denotes a type ([temp.deduct]), otherwise R is weak_ordering.

Mandates: R denotes a comparison category type ([cmp.categories]).

Returns: static_cast<R>(lhs.compare(rhs) <=> 0).

[Note 1:

The usage of type_identity_t as parameter ensures that an object of type basic_string_view<charT, traits> can always be compared with an object of a type T with an implicit conversion to basic_string_view<charT, traits>, and vice versa, as per [over.match.oper].

— end note]