- Extracted traits from class to a detail namespace.

lib/include/srslte/adt/span.h

@@ -31,37 +31,38 @@
 
 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
-{
-  /// Helper traits used by SFINAE expressions in constructors.
+class span;
+
+namespace detail {
 
-  template <typename... Ts>
-  struct make_void {
+/// 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;
-
-  template <typename U>
-  struct is_span : std::false_type {};
-  template <typename U>
-  struct is_span<span<U> > : std::true_type {};
-
-  template <typename U>
-  struct is_std_array : std::false_type {};
-  template <typename U, std::size_t N>
-  struct is_std_array<std::array<U, N> > : std::true_type {};
-
-  template <typename U>
-  using remove_cvref_t = typename std::remove_cv<typename std::remove_reference<U>::type>::type;
-
-  template <class Container, class U, class = void>
-  struct is_container_compatible : public std::false_type {};
-  template <class Container, class U>
-  struct is_container_compatible<
+};
+
+template <typename... Ts>
+using void_t = typename make_void<Ts...>::type;
+
+template <typename U>
+struct is_span : std::false_type {};
+template <typename U>
+struct is_span<span<U> > : std::true_type {};
+
+template <typename U>
+struct is_std_array : std::false_type {};
+template <typename U, std::size_t N>
+struct is_std_array<std::array<U, N> > : std::true_type {};
+
+template <typename U>
+using remove_cvref_t = typename std::remove_cv<typename std::remove_reference<U>::type>::type;
+
+template <class Container, class U, class = void>
+struct is_container_compatible : public std::false_type {};
+template <class Container, class U>
+struct is_container_compatible<
     Container,
     U,
     void_t<
@@ -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())
   {}