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Implement variadic templates based fusion::vector.

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Thanks to Lee Clagett.
This commit is contained in:
Kohei Takahashi
2015-06-28 01:13:32 +09:00
parent c77f84749f
commit 969b475462
15 changed files with 493 additions and 22 deletions
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30
include/boost/fusion/container/generation/make_vector.hpp
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@ -27,16 +27,38 @@ namespace boost { namespace fusion
template <typename ...T>
struct make_vector
{
typedef vector<typename detail::as_fusion_element<T>::type...> type;
// make `make_vector<T..., void_...>' into `make_vector<T...>'
template <typename, typename...> struct trim_void;
template <typename... U>
struct trim_void<vector<U...> >
{
typedef vector<numbered_vector_tag<sizeof...(U)>, U...> type;
};
template <typename... U, typename... Tail>
struct trim_void<vector<U...>, void_, Tail...>
: trim_void<vector<U...> > { };
template <typename... U, typename Head, typename... Tail>
struct trim_void<vector<U...>, Head, Tail...>
: trim_void<vector<U..., Head>, Tail...> { };
typedef
typename trim_void<
vector<>
, typename detail::as_fusion_element<T>::type...
>::type
type;
};
}
template <typename ...T>
BOOST_FUSION_GPU_ENABLED
inline vector<typename detail::as_fusion_element<T>::type...>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
inline typename result_of::make_vector<T...>::type
make_vector(T const&... arg)
{
return vector<typename detail::as_fusion_element<T>::type...>(arg...);
return typename result_of::make_vector<T...>::type(arg...);
}
}}