Pull in some dependencies of Boost.Range.

boost/preprocessor/facilities/is_empty_variadic.hpp

@@ -0,0 +1,57 @@
+# /* **************************************************************************
+#  *                                                                          *
+#  *     (C) Copyright Edward Diener 2014.
+#  *     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)
+#  *                                                                          *
+#  ************************************************************************** */
+#
+# /* See http://www.boost.org for most recent version. */
+#
+# ifndef BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP
+# define BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP
+#
+# include <boost/preprocessor/config/config.hpp>
+#
+# if BOOST_PP_VARIADICS
+#
+# include <boost/preprocessor/punctuation/is_begin_parens.hpp>
+# include <boost/preprocessor/facilities/detail/is_empty.hpp>
+#
+#if BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400
+#
+#define BOOST_PP_IS_EMPTY(param) \
+    BOOST_PP_DETAIL_IS_EMPTY_IIF \
+      ( \
+      BOOST_PP_IS_BEGIN_PARENS \
+        ( \
+        param \
+        ) \
+      ) \
+      ( \
+      BOOST_PP_IS_EMPTY_ZERO, \
+      BOOST_PP_DETAIL_IS_EMPTY_PROCESS \
+      ) \
+    (param) \
+/**/
+#define BOOST_PP_IS_EMPTY_ZERO(param) 0
+# else
+#define BOOST_PP_IS_EMPTY(...) \
+    BOOST_PP_DETAIL_IS_EMPTY_IIF \
+      ( \
+      BOOST_PP_IS_BEGIN_PARENS \
+        ( \
+        __VA_ARGS__ \
+        ) \
+      ) \
+      ( \
+      BOOST_PP_IS_EMPTY_ZERO, \
+      BOOST_PP_DETAIL_IS_EMPTY_PROCESS \
+      ) \
+    (__VA_ARGS__) \
+/**/
+#define BOOST_PP_IS_EMPTY_ZERO(...) 0
+# endif /* BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400 */
+# endif /* BOOST_PP_VARIADICS */
+# endif /* BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP */