| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2012 Paul Fultz II |
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| 3 | seq.h |
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| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | ==============================================================================*/ |
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| 7 | |
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| 8 | #ifndef BOOST_HOF_GUARD_FUNCTION_DETAIL_SEQ_H |
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| 9 | #define BOOST_HOF_GUARD_FUNCTION_DETAIL_SEQ_H |
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| 10 | |
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| 11 | #include <cstdlib> |
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| 12 | |
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| 13 | namespace boost { namespace hof { |
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| 14 | |
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| 15 | namespace detail { |
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| 16 | |
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| 17 | template<std::size_t ...> |
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| 18 | struct seq |
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| 19 | { |
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| 20 | typedef seq type; |
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| 21 | }; |
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| 22 | |
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| 23 | template <class, class> |
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| 24 | struct merge_seq; |
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| 25 | |
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| 26 | template <size_t... Xs, size_t... Ys> |
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| 27 | struct merge_seq<seq<Xs...>, seq<Ys...>> |
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| 28 | : seq<Xs..., (sizeof...(Xs)+Ys)...> |
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| 29 | {}; |
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| 30 | |
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| 31 | template<std::size_t N> |
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| 32 | struct gens |
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| 33 | : merge_seq< |
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| 34 | typename gens<N/2>::type, |
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| 35 | typename gens<N - N/2>::type |
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| 36 | > |
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| 37 | {}; |
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| 38 | |
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| 39 | template<> struct gens<0> : seq<> {}; |
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| 40 | template<> struct gens<1> : seq<0> {}; |
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| 41 | |
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| 42 | |
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| 43 | } |
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| 44 | }} // namespace boost::hof |
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| 45 | |
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| 46 | #endif |
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| 47 | |
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