Chris@16: #if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
Chris@16: 
Chris@16:     #include <boost/proto/context/detail/preprocessed/null_eval.hpp>
Chris@16: 
Chris@16: #elif !defined(BOOST_PP_IS_ITERATING)
Chris@16: 
Chris@16:     #define BOOST_PROTO_EVAL_N(Z, N, DATA)                                                          \
Chris@16:         proto::eval(proto::child_c<N>(expr), ctx);                                                  \
Chris@16:         /**/
Chris@16: 
Chris@16:     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
Chris@16:         #pragma wave option(preserve: 2, line: 0, output: "preprocessed/null_eval.hpp")
Chris@16:     #endif
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////////
Chris@16:     /// \file null_eval.hpp
Chris@16:     /// Contains specializations of the null_eval\<\> class template.
Chris@16:     //
Chris@16:     //  Copyright 2008 Eric Niebler. Distributed under the Boost
Chris@16:     //  Software License, Version 1.0. (See accompanying file
Chris@16:     //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16:     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
Chris@16:         #pragma wave option(preserve: 1)
Chris@16:     #endif
Chris@16: 
Chris@16:     #define BOOST_PP_ITERATION_PARAMS_1                                                             \
Chris@16:         (3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/context/detail/null_eval.hpp>))
Chris@16:     #include BOOST_PP_ITERATE()
Chris@16: 
Chris@16:     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
Chris@16:         #pragma wave option(output: null)
Chris@16:     #endif
Chris@16: 
Chris@16:     #undef BOOST_PROTO_EVAL_N
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16:     #define N BOOST_PP_ITERATION()
Chris@16: 
Chris@16:     template<typename Expr, typename Context>
Chris@16:     struct null_eval<Expr, Context, N>
Chris@16:     {
Chris@16:         typedef void result_type;
Chris@16: 
Chris@16:         void operator ()(Expr &expr, Context &ctx) const
Chris@16:         {
Chris@16:             BOOST_PP_REPEAT(N, BOOST_PROTO_EVAL_N, ~)
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     #undef N
Chris@16: 
Chris@16: #endif