Avoid reopening namespace std

Author: frederick-vs-ja

include/Beman/Optional26/optional.hpp

@@ -6,7 +6,6 @@
 
 /*
 22.5.2 Header <optional> synopsis[optional.syn]
-🔗
 
 #include <compare>              // see [compare.syn]
 
@@ -210,23 +209,20 @@ class optional;
 
 } // namespace beman::optional26
 
-namespace std {
 // Since P3168R2: Give std::optional Range Support.
 template <typename T>
-inline constexpr bool ranges::enable_view<beman::optional26::optional<T>> = true;
+inline constexpr bool std::ranges::enable_view<beman::optional26::optional<T>> = true;
 
 // TODO: document why this is needed.
 template <typename T>
-inline constexpr bool ranges::enable_borrowed_range<beman::optional26::optional<T&>> = true;
+inline constexpr bool std::ranges::enable_borrowed_range<beman::optional26::optional<T&>> = true;
 
 // Since P3168R2: Give std::optional Range Support.
 #if defined(__cpp_lib_format_ranges)
 template <class T>
-inline constexpr auto format_kind<beman::optional26::optional<T>> = range_format::disabled;
+inline constexpr auto std::format_kind<beman::optional26::optional<T>> = range_format::disabled;
 #endif
 
-} // namespace std
-
 namespace beman::optional26 {
 template <class T>
 concept is_derived_from_optional = requires(const T& t) { []<class U>(const optional<U>&) {}(t); };