[libc++] [ranges] Whitespace and namespace-style adjustments. NFC.

Largely split out of D116199 to keep that PR smaller.

libcxx/include/__ranges/access.h

@@ -33,7 +33,9 @@ namespace ranges {
 } // namespace ranges
 
 // [range.access.begin]
-namespace ranges::__begin {
+
+namespace ranges {
+namespace __begin {
   template <class _Tp>
   concept __member_begin =
     __can_borrow<_Tp> &&
@@ -79,19 +81,24 @@ namespace ranges::__begin {
 
     void operator()(auto&&) const = delete;
   };
-} // namespace ranges::__begin
+}
 
-namespace ranges {
 inline namespace __cpo {
   inline constexpr auto begin = __begin::__fn{};
 } // namespace __cpo
+} // namespace ranges
 
+// [range.range]
+
+namespace ranges {
   template <class _Tp>
   using iterator_t = decltype(ranges::begin(declval<_Tp&>()));
 } // namespace ranges
 
 // [range.access.end]
-namespace ranges::__end {
+
+namespace ranges {
+namespace __end {
   template <class _Tp>
   concept __member_end =
     __can_borrow<_Tp> &&
@@ -140,13 +147,17 @@ namespace ranges::__end {
 
     void operator()(auto&&) const = delete;
   };
-} // namespace ranges::__end
+}
 
-namespace ranges::inline __cpo {
+inline namespace __cpo {
   inline constexpr auto end = __end::__fn{};
-} // namespace ranges::__cpo
+} // namespace __cpo
+} // namespace ranges
 
-namespace ranges::__cbegin {
+// [range.access.cbegin]
+
+namespace ranges {
+namespace __cbegin {
   struct __fn {
     template <class _Tp>
       requires invocable<decltype(ranges::begin), _Tp const&>
@@ -164,13 +175,17 @@ namespace ranges::__cbegin {
       return ranges::begin(static_cast<_Tp const&&>(__t));
     }
   };
-} // namespace ranges::__cbegin
+}
 
-namespace ranges::inline __cpo {
+inline namespace __cpo {
   inline constexpr auto cbegin = __cbegin::__fn{};
-} // namespace ranges::__cpo
+} // namespace __cpo
+} // namespace ranges
 
-namespace ranges::__cend {
+// [range.access.cend]
+
+namespace ranges {
+namespace __cend {
   struct __fn {
     template <class _Tp>
       requires invocable<decltype(ranges::end), _Tp const&>
@@ -188,11 +203,12 @@ namespace ranges::__cend {
       return ranges::end(static_cast<_Tp const&&>(__t));
     }
   };
-} // namespace ranges::__cend
+}
 
-namespace ranges::inline __cpo {
+inline namespace __cpo {
   inline constexpr auto cend = __cend::__fn{};
-} // namespace ranges::__cpo
+} // namespace __cpo
+} // namespace ranges
 
 #endif // !defined(_LIBCPP_HAS_NO_RANGES)
 

libcxx/include/__ranges/data.h

@@ -26,8 +26,9 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 #if !defined(_LIBCPP_HAS_NO_RANGES)
 
-namespace ranges {
 // [range.prim.data]
+
+namespace ranges {
 namespace __data {
   template <class _Tp>
   concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>;
@@ -64,7 +65,7 @@ namespace __data {
       return _VSTD::to_address(ranges::begin(_VSTD::forward<_Tp>(__t)));
     }
   };
-} // end namespace __data
+}
 
 inline namespace __cpo {
   inline constexpr auto data = __data::__fn{};

libcxx/include/__ranges/empty.h

@@ -23,8 +23,9 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 #if !defined(_LIBCPP_HAS_NO_RANGES)
 
-namespace ranges {
 // [range.prim.empty]
+
+namespace ranges {
 namespace __empty {
   template <class _Tp>
   concept __member_empty = requires(_Tp&& __t) {

libcxx/include/__ranges/size.h

@@ -28,8 +28,11 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 namespace ranges {
   template<class>
   inline constexpr bool disable_sized_range = false;
+}
 
 // [range.prim.size]
+
+namespace ranges {
 namespace __size {
   void size(auto&) = delete;
   void size(const auto&) = delete;
@@ -90,18 +93,23 @@ namespace __size {
       return _VSTD::__to_unsigned_like(ranges::end(__t) - ranges::begin(__t));
     }
   };
-} // end namespace __size
+}
 
 inline namespace __cpo {
   inline constexpr auto size = __size::__fn{};
 } // namespace __cpo
+} // namespace ranges
 
+// [range.prim.ssize]
+
+namespace ranges {
 namespace __ssize {
   struct __fn {
     template<class _Tp>
       requires requires (_Tp&& __t) { ranges::size(__t); }
     [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr integral auto operator()(_Tp&& __t) const
-        noexcept(noexcept(ranges::size(__t))) {
+      noexcept(noexcept(ranges::size(__t)))
+    {
       using _Signed = make_signed_t<decltype(ranges::size(__t))>;
       if constexpr (sizeof(ptrdiff_t) > sizeof(_Signed))
         return static_cast<ptrdiff_t>(ranges::size(__t));