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///////////////////////////////////////////////////////////////////////////////
/// \file pack.hpp
/// Contains helpers for pseudo-pack expansion.
//
// Copyright 2012 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)
#ifndef BOOST_PROTO_TRANSFORM_DETAIL_PACK_HPP_EAN_2012_07_11
#define BOOST_PROTO_TRANSFORM_DETAIL_PACK_HPP_EAN_2012_07_11
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/arithmetic/inc.hpp>
#include <boost/preprocessor/arithmetic/dec.hpp>
#include <boost/preprocessor/arithmetic/sub.hpp>
#include <boost/preprocessor/punctuation/comma_if.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
#include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
#include <boost/preprocessor/repetition/repeat.hpp>
#include <boost/preprocessor/iteration/local.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/proto/proto_fwd.hpp>
#if defined(_MSC_VER)
# pragma warning(push)
# pragma warning(disable: 4348) // redefinition of default parameter
#endif
namespace boost { namespace proto
{
namespace detail
{
template<typename Fun>
struct msvc_fun_workaround;
template<typename Tfx, typename T>
struct expand_pattern_helper
{
typedef T type;
typedef mpl::false_ applied;
};
template<typename Tfx, typename Fun>
struct expand_pattern_helper<Tfx, Fun *>
: expand_pattern_helper<Tfx, Fun>
{};
template<typename Tfx, typename T>
struct expand_pattern_helper<Tfx, pack(T)>
{
// BUGBUG fix me. See comment in transform/detail/call.hpp
BOOST_MPL_ASSERT_MSG(
(is_same<T, _>::value)
, PACK_EXPANSIONS_OF_EXPRESSIONS_OTHER_THAN_THE_CURRENT_NOT_YET_SUPPORTED
, (T)
);
typedef Tfx type(T);
typedef mpl::true_ applied;
};
template<typename Tfx>
struct expand_pattern_helper<Tfx, pack(_)>
{
typedef Tfx type;
typedef mpl::true_ applied;
};
#include <boost/proto/transform/detail/expand_pack.hpp>
template<long Arity, typename Fun, typename Cont>
struct expand_pattern;
template<typename Fun, typename Cont>
struct expand_pattern<0, Fun, Cont>
: Cont::template cat<typename expand_pattern_helper<proto::_value, Fun>::type>
{
BOOST_MPL_ASSERT_MSG(
(expand_pattern_helper<proto::_value, Fun>::applied::value)
, NO_PACK_EXPRESSION_FOUND_IN_PACK_EXPANSION
, (Fun)
);
};
#include <boost/proto/transform/detail/pack_impl.hpp>
}
}}
#if defined(_MSC_VER)
# pragma warning(pop)
#endif
#endif
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