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3rdparty/boost_1_81_0/boost/asio/detail/utility.hpp 1.88 KB
63e88f80   Hu Chunming   提交三方库
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  //
  // detail/utility.hpp
  // ~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
  //
  // Distributed under the Boost Software License, Version 1.0. (See accompanying
  // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  //
  
  #ifndef BOOST_ASIO_DETAIL_UTILITY_HPP
  #define BOOST_ASIO_DETAIL_UTILITY_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include <boost/asio/detail/config.hpp>
  #include <utility>
  
  namespace boost {
  namespace asio {
  namespace detail {
  
  #if defined(BOOST_ASIO_HAS_STD_INDEX_SEQUENCE)
  
  using std::index_sequence;
  using std::index_sequence_for;
  using std::make_index_sequence;
  
  #elif defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
  
  template <std::size_t...>
  struct index_sequence
  {
  };
  
  template <typename T, typename U>
  struct join_index_sequences;
  
  template <std::size_t... I, std::size_t... J>
  struct join_index_sequences<index_sequence<I...>, index_sequence<J...> >
  {
    using type = index_sequence<I..., J...>;
  };
  
  template <std::size_t First, std::size_t Last>
  struct index_pack :
    join_index_sequences<
      typename index_pack<First, First + (Last - First + 1) / 2 - 1>::type,
      typename index_pack<First + (Last - First + 1) / 2, Last>::type
    >
  {
  };
  
  template <std::size_t N>
  struct index_pack<N, N>
  {
    using type = index_sequence<N>;
  };
  
  template <std::size_t Begin, std::size_t End>
  struct index_range : index_pack<Begin, End - 1>
  {
  };
  
  template <std::size_t N>
  struct index_range<N, N>
  {
    using type = index_sequence<>;
  };
  
  template <typename... T>
  using index_sequence_for = typename index_range<0, sizeof...(T)>::type;
  
  template <std::size_t N>
  using make_index_sequence = typename index_range<0, N>::type;
  
  #endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
  
  } // namespace detail
  } // namespace asio
  } // namespace boost
  
  #endif // BOOST_ASIO_DETAIL_UTILITY_HPP