Imported Upstream version 1.57.0

[platform/upstream/boost.git] / boost / spirit / home / qi / detail / unused_skipper.hpp

diff --git a/boost/spirit/home/qi/detail/unused_skipper.hpp b/boost/spirit/home/qi/detail/unused_skipper.hpp
index c1405d6..b8a51f3 100644 (file)
--- a/boost/spirit/home/qi/detail/unused_skipper.hpp
+++ b/boost/spirit/home/qi/detail/unused_skipper.hpp
@@ -11,14 +11,15 @@
 #endif
 
 #include <boost/spirit/home/support/unused.hpp>
+#include <boost/mpl/bool.hpp>
 
 namespace boost { namespace spirit { namespace qi { namespace detail
 {
     template <typename Skipper>
     struct unused_skipper : unused_type
     {
-        unused_skipper(Skipper const& skipper)
-          : skipper(skipper) {}
+        unused_skipper(Skipper const& skipper_)
+          : skipper(skipper_) {}
         Skipper const& skipper;
 
     private:
@@ -26,12 +27,24 @@ namespace boost { namespace spirit { namespace qi { namespace detail
         unused_skipper& operator= (unused_skipper const&);
     };
 
+    template <typename Skipper>
+    struct is_unused_skipper
+      : mpl::false_ {};
+
+    template <typename Skipper>
+    struct is_unused_skipper<unused_skipper<Skipper> >
+      : mpl::true_ {};
+
+    template <>
+    struct is_unused_skipper<unused_type>
+      : mpl::true_ {};
+
     // If a surrounding lexeme[] directive was specified, the current
-    // skipper is of the type unused_skipper. In this case we 
+    // skipper is of the type unused_skipper. In this case we
     // re-activate the skipper which was active before the skip[]
     // directive.
     template <typename Skipper>
-    inline Skipper const& 
+    inline Skipper const&
     get_skipper(unused_skipper<Skipper> const& u)
     {
         return u.skipper;
@@ -39,7 +52,7 @@ namespace boost { namespace spirit { namespace qi { namespace detail
 
     // If no surrounding lexeme[] directive was specified we keep what we got.
     template <typename Skipper>
-    inline Skipper const& 
+    inline Skipper const&
     get_skipper(Skipper const& u)
     {
         return u;