comparison DEPENDENCIES/generic/include/boost/spirit/home/qi/detail/unused_skipper.hpp @ 16:2665513ce2d3

Add boost headers

+//  Copyright (c) 2001-2011 Hartmut Kaiser
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#if !defined(BOOST_SPIRIT_QI_UNUSED_SKIPPER_JUL_25_2009_0921AM)
+#define BOOST_SPIRIT_QI_UNUSED_SKIPPER_JUL_25_2009_0921AM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/support/unused.hpp>
+
+namespace boost { namespace spirit { namespace qi { namespace detail
+{
+    template <typename Skipper>
+    struct unused_skipper : unused_type
+    {
+        unused_skipper(Skipper const& skipper_)
+          : skipper(skipper_) {}
+        Skipper const& skipper;
+
+    private:
+        // silence MSVC warning C4512: assignment operator could not be generated
+        unused_skipper& operator= (unused_skipper const&);
+    };
+
+    // If a surrounding lexeme[] directive was specified, the current
+    // 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& 
+    get_skipper(unused_skipper<Skipper> const& u)
+    {
+        return u.skipper;
+    }
+
+    // If no surrounding lexeme[] directive was specified we keep what we got.
+    template <typename Skipper>
+    inline Skipper const& 
+    get_skipper(Skipper const& u)
+    {
+        return u;
+    }
+
+}}}}
+
+#endif