- Extracted traits from class to a detail namespace.

lib/include/srslte/adt/span.h

@@ -31,17 +31,18 @@
 
 namespace srslte {
 
-/// The class template span describes an object that can refer to a contiguous sequence of objects with the first
-/// element of the sequence at position zero.
 template <typename T>
-class span
-{
+class span;
+
+namespace detail {
+
 /// Helper traits used by SFINAE expressions in constructors.
 
 template <typename... Ts>
 struct make_void {
   typedef void type;
 };
+
 template <typename... Ts>
 using void_t = typename make_void<Ts...>::type;
 
@@ -80,6 +81,13 @@ class span
                                 U (*)[]>::value,
             int>::type> > : public std::true_type {};
 
+} // namespace detail
+
+/// The class template span describes an object that can refer to a contiguous sequence of objects with the first
+/// element of the sequence at position zero.
+template <typename T>
+class span
+{
 public:
   /// Member types.
   using element_type     = T;
@@ -123,13 +131,14 @@ public:
 
   /// Constructs a span that is a view over the container c.
   template <typename Container,
-            typename std::enable_if<is_container_compatible<Container, element_type>::value, int>::type = 0>
+            typename std::enable_if<detail::is_container_compatible<Container, element_type>::value, int>::type = 0>
   constexpr span(Container& c) noexcept : ptr(c.data()), len(c.size())
   {}
 
   /// Constructs a span that is a view over the container c.
-  template <typename Container,
-            typename std::enable_if<is_container_compatible<const Container, element_type>::value, int>::type = 0>
+  template <
+      typename Container,
+      typename std::enable_if<detail::is_container_compatible<const Container, element_type>::value, int>::type = 0>
   constexpr span(const Container& c) noexcept : ptr(c.data()), len(c.size())
   {}