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#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
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Swift