template<class charT, class traits, class Allocator>
constexpr bool
operator==(const basic_string<charT, traits, Allocator>& lhs,
const basic_string<charT, traits, Allocator>& rhs) noexcept;
template<class charT, class traits, class Allocator>
constexpr bool operator==(const basic_string<charT, traits, Allocator>& lhs,
const charT* rhs);
template<class charT, class traits, class Allocator>
constexpr see below operator<=>(const basic_string<charT, traits, Allocator>& lhs,
const basic_string<charT, traits, Allocator>& rhs) noexcept;
template<class charT, class traits, class Allocator>
constexpr see below operator<=>(const basic_string<charT, traits, Allocator>& lhs,
const charT* rhs);