gcc-4.8 fix

Author: HDembinski

include/boost/histogram/histogram_impl_static.hpp

@@ -238,35 +238,43 @@ class histogram<Static, Axes, Storage> {
   inline void xlin_w(std::size_t &, std::size_t &, double &) const {}
 
   template <unsigned D, typename First, typename... Rest>
-  inline void xlin_w(std::size_t &idx, std::size_t &stride, double &x,
+  inline
+  typename disable_if<is_same<First, weight>>::type
+  xlin_w(std::size_t &idx, std::size_t &stride, double &x,
                      First &&first, Rest &&... rest) const {
     detail::xlin(idx, stride, fusion::at_c<D>(axes_),
                  std::forward<First>(first));
     return xlin_w<D + 1>(idx, stride, x, std::forward<Rest>(rest)...);
   }
 
-  template <unsigned D, typename... Rest>
-  inline void xlin_w(std::size_t &idx, std::size_t &stride, double &x,
-                     const weight w, Rest &&... rest) const {
-    x = w.value;
+  template <unsigned D, typename First, typename... Rest>
+  inline
+  typename enable_if<is_same<First, weight>>::type
+  xlin_w(std::size_t &idx, std::size_t &stride, double &x,
+                     First &&first, Rest &&... rest) const {
+    x = first.value;
     return xlin_w<D>(idx, stride, x, std::forward<Rest>(rest)...);
   }
 
   template <unsigned D>
   inline void xlin_n(std::size_t &, std::size_t &, unsigned &) const {}
 
   template <unsigned D, typename First, typename... Rest>
-  inline void xlin_n(std::size_t &idx, std::size_t &stride, unsigned &x,
+  inline
+  typename disable_if<is_same<First, count>>::type
+  xlin_n(std::size_t &idx, std::size_t &stride, unsigned &x,
                      First &&first, Rest &&... rest) const {
     detail::xlin(idx, stride, fusion::at_c<D>(axes_),
                  std::forward<First>(first));
     return xlin_n<D + 1>(idx, stride, x, std::forward<Rest>(rest)...);
   }
 
-  template <unsigned D, typename... Rest>
-  inline void xlin_n(std::size_t &idx, std::size_t &stride, unsigned &x,
-                     const count c, Rest &&... rest) const {
-    x = c.value;
+  template <unsigned D, typename First, typename... Rest>
+  inline
+  typename enable_if<is_same<First, count>>::type
+  xlin_n(std::size_t &idx, std::size_t &stride, unsigned &x,
+         First&& first, Rest &&... rest) const {
+    x = first.value;
     return xlin_n<D>(idx, stride, x, std::forward<Rest>(rest)...);
   }