Created
December 9, 2014 15:22
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make_tuple_indices extracts elements from tuple
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| template <std::size_t...> struct tuple_indices {}; | |
| template <std::size_t Sp, class IntTuple, std::size_t Ep> struct make_indices_imp; | |
| template <std::size_t Sp, std::size_t... Indices, std::size_t Ep> | |
| struct make_indices_imp<Sp, tuple_indices<Indices...>, Ep> | |
| { typedef typename make_indices_imp<Sp+1, tuple_indices<Indices..., Sp>, Ep>::type type; }; | |
| template <std::size_t Ep, std::size_t... Indices> | |
| struct make_indices_imp<Ep, tuple_indices<Indices...>, Ep> | |
| { typedef tuple_indices<Indices...> type; }; | |
| template <std::size_t Ep, std::size_t Sp = 0> | |
| struct make_tuple_indices { | |
| static_assert(Sp <= Ep, "make_tuple_indices input error"); | |
| typedef typename make_indices_imp<Sp, tuple_indices<>, Ep>::type type; | |
| }; |
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