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/*=============================================================================
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(BOOST_PP_IS_ITERATING)
#if !defined(PHOENIX_CORE_DETAIL_FUNCTION_EVAL_HPP)
#define PHOENIX_CORE_DETAIL_FUNCTION_EVAL_HPP
#include <boost/preprocessor/iterate.hpp>
#include <boost/preprocessor/enum.hpp>
#include <boost/preprocessor/repeat.hpp>
#include <boost/preprocessor/dec.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/find.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/type_traits/remove_reference.hpp>
// we assume that mpl::vectorN, where N = PHOENIX_COMPOSITE_LIMIT
// is included already.
namespace boost { namespace phoenix { namespace detail
{
template <int N>
struct function_eval;
template <>
struct function_eval<0>
{
template <typename Env, typename F>
struct result
{
typedef typename
remove_reference<
typename F::template result<Env>::type
>::type
fn;
typedef typename fn::result_type type;
};
template <typename RT, typename Env, typename F>
static RT
eval(Env const& env, F const& f)
{
return f.eval(env)();
}
};
template <typename T>
T& help_rvalue_deduction(T& x)
{
return x;
}
template <typename T>
T const& help_rvalue_deduction(T const& x)
{
return x;
}
// When we call f(_0, _1...) we remove the reference when deducing f's
// return type. $$$ Explain why $$$
#define PHOENIX_GET_ARG(z, n, data) \
typedef typename \
remove_reference< \
typename BOOST_PP_CAT(A, n)::template result<Env>::type \
>::type \
BOOST_PP_CAT(a, n);
#define PHOENIX_EVAL_ARG(z, n, data) \
help_rvalue_deduction(BOOST_PP_CAT(_, n).eval(env))
#define BOOST_PP_ITERATION_PARAMS_1 \
(3, (1, BOOST_PP_DEC(PHOENIX_COMPOSITE_LIMIT), \
"boost/spirit/home/phoenix/core/detail/function_eval.hpp"))
#include BOOST_PP_ITERATE()
}}} // namespace boost::phoenix::detail
#undef PHOENIX_GET_ARG
#undef PHOENIX_EVAL_ARG
#endif
///////////////////////////////////////////////////////////////////////////////
//
// Preprocessor vertical repetition code
//
///////////////////////////////////////////////////////////////////////////////
#else // defined(BOOST_PP_IS_ITERATING)
#define N BOOST_PP_ITERATION()
template <>
struct function_eval<N>
{
template <typename Env, typename F
, BOOST_PP_ENUM_PARAMS(N, typename A)>
struct result
{
typedef typename
remove_reference<
typename F::template result<Env>::type
>::type
fn;
BOOST_PP_REPEAT(N, PHOENIX_GET_ARG, _)
typedef BOOST_PP_CAT(mpl::vector, N)
<BOOST_PP_ENUM_PARAMS(N, a)>
args;
typedef typename
fn::template result<BOOST_PP_ENUM_PARAMS(N, a)>
function_apply;
typedef typename
mpl::eval_if<
is_same<
typename mpl::find<args, fusion::void_>::type
, typename mpl::end<args>::type>
, function_apply
, mpl::identity<fusion::void_>
>::type
type;
};
template <typename RT, typename Env, typename F
, BOOST_PP_ENUM_PARAMS(N, typename A)>
static RT
eval(Env const& env, F const& f
, BOOST_PP_ENUM_BINARY_PARAMS(N, A, & _))
{
return f.eval(env)(BOOST_PP_ENUM(N, PHOENIX_EVAL_ARG, _));
}
};
#undef N
#endif // defined(BOOST_PP_IS_ITERATING)
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Swift