ceph/src/boost/boost/poly_collection/detail/segment_backend.hpp

   1 /* Copyright 2016-2017 Joaquin M Lopez Munoz.
   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/poly_collection for library home page.
   7  */
   8
   9 #ifndef BOOST_POLY_COLLECTION_DETAIL_SEGMENT_BACKEND_HPP
  10 #define BOOST_POLY_COLLECTION_DETAIL_SEGMENT_BACKEND_HPP
  11
  12 #if defined(_MSC_VER)
  13 #pragma once
  14 #endif
  15
  16 #include <cstddef>
  17 #include <memory>
  18 #include <utility>
  19
  20 namespace boost{
  21
  22 namespace poly_collection{
  23
  24 namespace detail{
  25
  26 /* Internal *virtual* interface of segment<Model,Allocator> (please note that
  27  * a non-virtual interface exists accessible thrown downcasting). Member
  28  * functions have been defined to minimize virtual function calls according to
  29  * usage patterns by poly_collection. For instance, ranges are returned rather
  30  * than iterators to allow for caching of and end sentinel at a higher level.
  31  * Passed elements are type erased with [const_]value_pointer.
  32  */
  33
  34 template<typename Model>
  35 struct segment_backend
  36 {
  37   using segment_backend_unique_ptr=
  38     std::unique_ptr<segment_backend,void(*)(segment_backend*)>;
  39   using value_pointer=void*;
  40   using const_value_pointer=const void*;
  41   using base_iterator=typename Model::base_iterator;
  42   using const_base_iterator=typename Model::const_base_iterator;
  43   template<typename T>
  44   using const_iterator=typename Model::template const_iterator<T>;
  45   using base_sentinel=typename Model::base_sentinel;
  46   using range=std::pair<base_iterator,base_sentinel>;
  47
  48   segment_backend()=default;
  49   segment_backend(const segment_backend&)=delete;
  50   segment_backend& operator=(const segment_backend&)=delete;
  51
  52   virtual                            ~segment_backend()=default;
  53   virtual segment_backend_unique_ptr copy()const=0;
  54   virtual segment_backend_unique_ptr empty_copy()const=0;
  55   virtual bool                       equal(const segment_backend&)const=0;
  56
  57   virtual base_iterator begin()const noexcept=0;
  58   virtual base_iterator end()const noexcept=0;
  59   virtual bool          empty()const noexcept=0;
  60   virtual std::size_t   size()const noexcept=0;
  61   virtual std::size_t   max_size()const noexcept=0;
  62   virtual std::size_t   capacity()const noexcept=0;
  63   virtual base_sentinel reserve(std::size_t)=0;
  64   virtual base_sentinel shrink_to_fit()=0;
  65   virtual range         push_back(const_value_pointer)=0;
  66   virtual range         push_back_move(value_pointer)=0;
  67   virtual range         insert(const_base_iterator,const_value_pointer)=0;
  68   virtual range         insert_move(const_base_iterator,value_pointer)=0;
  69   virtual range         erase(const_base_iterator)=0;
  70   virtual range         erase(const_base_iterator,const_base_iterator)=0;
  71   virtual range         erase_till_end(const_base_iterator)=0;
  72   virtual range         erase_from_begin(const_base_iterator)=0;
  73   virtual base_sentinel clear()noexcept=0;
  74 };
  75
  76 } /* namespace poly_collection::detail */
  77
  78 } /* namespace poly_collection */
  79
  80 } /* namespace boost */
  81
  82 #endif