Added boost header

test/external/boost/proto/context/detail/null_eval.hpp

@@ -0,0 +1,54 @@
+#if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
+
+    #include <boost/proto/context/detail/preprocessed/null_eval.hpp>
+
+#elif !defined(BOOST_PP_IS_ITERATING)
+
+    #define BOOST_PROTO_EVAL_N(Z, N, DATA)                                                          \
+        proto::eval(proto::child_c<N>(expr), ctx);                                                  \
+        /**/
+
+    #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
+        #pragma wave option(preserve: 2, line: 0, output: "preprocessed/null_eval.hpp")
+    #endif
+
+    ///////////////////////////////////////////////////////////////////////////////
+    /// \file null_eval.hpp
+    /// Contains specializations of the null_eval\<\> class template.
+    //
+    //  Copyright 2008 Eric Niebler. 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(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
+        #pragma wave option(preserve: 1)
+    #endif
+
+    #define BOOST_PP_ITERATION_PARAMS_1                                                             \
+        (3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/context/detail/null_eval.hpp>))
+    #include BOOST_PP_ITERATE()
+
+    #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
+        #pragma wave option(output: null)
+    #endif
+
+    #undef BOOST_PROTO_EVAL_N
+
+#else
+
+    #define N BOOST_PP_ITERATION()
+
+    template<typename Expr, typename Context>
+    struct null_eval<Expr, Context, N>
+    {
+        typedef void result_type;
+
+        void operator ()(Expr &expr, Context &ctx) const
+        {
+            BOOST_PP_REPEAT(N, BOOST_PROTO_EVAL_N, ~)
+        }
+    };
+
+    #undef N
+
+#endif