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index_sequence.hpp
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1 /*******************************************************************************
2  * tlx/meta/index_sequence.hpp
3  *
4  * Part of tlx - http://panthema.net/tlx
5  *
6  * Copyright (C) 2016-2017 Timo Bingmann <[email protected]>
7  *
8  * All rights reserved. Published under the Boost Software License, Version 1.0
9  ******************************************************************************/
10 
11 #ifndef TLX_META_INDEX_SEQUENCE_HEADER
12 #define TLX_META_INDEX_SEQUENCE_HEADER
13 
14 #include <cstddef>
15 
16 namespace tlx {
17 
18 //! \addtogroup tlx_meta
19 //! \{
20 
21 // Compile-time integer sequences, an implementation of std::index_sequence and
22 // std::make_index_sequence, as these are not available in many current
23 // libraries (MS Visual C++).
24 template <size_t... Indexes>
26  static size_t size() { return sizeof ... (Indexes); }
27 };
28 
29 namespace meta_detail {
30 
31 template <size_t CurrentIndex, size_t... Indexes>
33 
34 template <size_t... Indexes>
35 struct make_index_sequence_helper<0, Indexes...>{
36  using type = index_sequence<Indexes...>;
37 };
38 
39 template <size_t CurrentIndex, size_t... Indexes>
41  using type = typename make_index_sequence_helper<
42  CurrentIndex - 1, CurrentIndex - 1, Indexes...>::type;
43 };
44 
45 } // namespace meta_detail
46 
47 template <size_t Size>
49  : public meta_detail::make_index_sequence_helper<Size>::type { };
50 
51 //! \}
52 
53 } // namespace tlx
54 
55 #endif // !TLX_META_INDEX_SEQUENCE_HEADER
56 
57 /******************************************************************************/
static size_t size()
typename make_index_sequence_helper< CurrentIndex-1, CurrentIndex-1, Indexes...>::type type