Imported existing code

libraries/include/boost/spirit/home/qi/operator/expect.hpp

@@ -0,0 +1,49 @@
+/*=============================================================================
+    Copyright (c) 2001-2007 Joel de Guzman
+
+    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(SPIRIT_EXPECT_APRIL_29_2007_0445PM)
+#define SPIRIT_EXPECT_APRIL_29_2007_0445PM
+
+#include <boost/spirit/home/qi/operator/sequence_base.hpp>
+#include <boost/spirit/home/qi/detail/expect_function.hpp>
+
+namespace boost { namespace spirit { namespace qi
+{
+    template <typename Iterator>
+    struct expectation_failure
+    {
+        Iterator first;
+        Iterator last;
+        std::string what;
+    };
+
+    struct expect : sequence_base<expect>
+    {
+        friend struct sequence_base<expect>;
+
+    private:
+
+        template <typename Iterator, typename Context, typename Skipper>
+        static detail::expect_function<
+            Iterator, Context, Skipper
+          , expectation_failure<Iterator> >
+        fail_function(
+            Iterator& first, Iterator const& last
+          , Context& context, Skipper const& skipper)
+        {
+            return detail::expect_function<
+                Iterator, Context, Skipper, expectation_failure<Iterator> >
+                (first, last, context, skipper);
+        }
+
+        static std::string what_()
+        {
+            return "expect[";
+        }
+    };
+}}}
+
+#endif