[string_view] disambiguate comparisons between std::string_view and rsl::string_view

Author: Tsche

include/rsl/string_view

@@ -310,6 +310,12 @@ template <std::ranges::contiguous_range R>
 basic_string_view(R&&) -> basic_string_view<std::ranges::range_value_t<R>>;
 
 // [string.view.comparison], non-member comparison functions
+template <typename CharT, typename Traits>
+constexpr bool operator==(basic_string_view<CharT, Traits> lhs, std::basic_string_view<CharT, Traits> rhs) noexcept {
+  // this is a better match for comparisons of rsl::string_view to std::string_view, it disambiguates
+  return std::string_view(lhs) == rhs;
+}
+
 template <typename CharT, typename Traits>
 constexpr bool operator==(basic_string_view<CharT, Traits> lhs,
                           std::type_identity_t<basic_string_view<CharT, Traits>> rhs) noexcept {
@@ -319,6 +325,13 @@ constexpr bool operator==(basic_string_view<CharT, Traits> lhs,
   return lhs.compare(rhs) == 0;
 }
 
+template <typename CharT, typename Traits>
+constexpr auto operator<=>(basic_string_view<CharT, Traits> lhs,
+                           std::basic_string_view<CharT, Traits> rhs) noexcept {
+  // better match for comparisons between rsl::string_view and std::string_view
+  return std::string_view(lhs) <=> rhs;
+}
+
 template <typename CharT, typename Traits>
 constexpr auto operator<=>(basic_string_view<CharT, Traits> lhs,
                            std::type_identity_t<basic_string_view<CharT, Traits>> rhs) noexcept {