ceph/src/boost/libs/test/include/boost/test/data/index_sequence.hpp

   1 //  (C) Copyright Gennadiy Rozental 2001.
   2 //  Distributed under the Boost Software License, Version 1.0.
   3 //  (See accompanying file LICENSE_1_0.txt or copy at
   4 //  http://www.boost.org/LICENSE_1_0.txt)
   5
   6 //  See http://www.boost.org/libs/test for the library home page.
   7 //
   8 /// @file
   9 /// Defines c++14 index_sequence implementation
  10 // ***************************************************************************
  11
  12 #ifndef BOOST_TEST_DATA_INDEX_SEQUENCE_HPP
  13 #define BOOST_TEST_DATA_INDEX_SEQUENCE_HPP
  14
  15 // Boost.Test
  16 #include <boost/test/data/config.hpp>
  17
  18 #include <boost/test/detail/suppress_warnings.hpp>
  19
  20 //____________________________________________________________________________//
  21
  22 namespace boost {
  23 namespace unit_test {
  24 namespace data {
  25
  26 // ************************************************************************** //
  27 // **************             data::index_sequence             ************** //
  28 // ************************************************************************** //
  29
  30 template <std::size_t... Ns>
  31 struct index_sequence {};
  32
  33 template<typename IS1, typename IS2>
  34 struct merge_index_sequence;
  35
  36 template <std::size_t... Ns1, std::size_t... Ns2>
  37 struct merge_index_sequence<index_sequence<Ns1...>, index_sequence<Ns2...>> {
  38     typedef index_sequence<Ns1..., Ns2...> type;
  39 };
  40
  41 template <std::size_t B, std::size_t E, typename Enabler = void>
  42 struct make_index_sequence {
  43     typedef typename merge_index_sequence<typename make_index_sequence<B,(B+E)/2>::type,
  44                                           typename make_index_sequence<(B+E)/2,E>::type>::type type;
  45 };
  46
  47 template <std::size_t B, std::size_t E>
  48 struct make_index_sequence<B,E,typename std::enable_if<E==B+1,void>::type> {
  49     typedef index_sequence<B> type;
  50 };
  51
  52 template <typename... T>
  53 using index_sequence_for = typename make_index_sequence<0, sizeof...(T)>::type;
  54
  55 } // namespace data
  56 } // namespace unit_test
  57 } // namespace boost
  58
  59 #include <boost/test/detail/enable_warnings.hpp>
  60
  61 #endif // BOOST_TEST_DATA_INDEX_SEQUENCE_HPP
  62