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traits: add nth_argument trait query

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This commit is contained in:
Danny Robson 2017-09-10 12:42:18 +10:00
parent ca3851c4de
commit a2995186f6
1 changed files with 13 additions and 0 deletions
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13
types/traits.hpp
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@ -257,4 +257,17 @@ struct func_traits : public ::detail::func_traits<
};
///////////////////////////////////////////////////////////////////////////////
template <std::size_t N, typename FuncT>
struct nth_argument : std::tuple_element<
N,
typename func_traits<FuncT>::argument_types
> { };
template <std::size_t N, typename FuncT>
using nth_argument_t = typename nth_argument<N, FuncT>::type;
#endif