glide_computer example added

src/include/units/bits/external/hacks.h

@@ -45,6 +45,7 @@
 #else
 
 #include <concepts/concepts.hpp>
+#include <range/v3/range.hpp>
 
 #endif
 
@@ -85,6 +86,13 @@ namespace std {
   using concepts::totally_ordered;
   using concepts::totally_ordered_with;
 
+  namespace ranges {
+
+  using ::ranges::forward_range;
+  using ::ranges::range_value_t;
+
+  }
+
   // missing in Range-v3
   template<class T>
   concept floating_point = std::is_floating_point_v<T>;