ceph/src/Beast/extras/beast/unit_test/detail/const_container.hpp

   1 //
   2 // Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
   3 //
   4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7
   8 #ifndef BEAST_UNIT_TEST_DETAIL_CONST_CONTAINER_HPP
   9 #define BEAST_UNIT_TEST_DETAIL_CONST_CONTAINER_HPP
  10
  11 namespace beast {
  12 namespace unit_test {
  13 namespace detail {
  14
  15 /** Adapter to constrain a container interface.
  16     The interface allows for limited read only operations. Derived classes
  17     provide additional behavior.
  18 */
  19 template<class Container>
  20 class const_container
  21 {
  22 private:
  23     using cont_type = Container;
  24
  25     cont_type m_cont;
  26
  27 protected:
  28     cont_type& cont()
  29     {
  30         return m_cont;
  31     }
  32
  33     cont_type const& cont() const
  34     {
  35         return m_cont;
  36     }
  37
  38 public:
  39     using value_type = typename cont_type::value_type;
  40     using size_type = typename cont_type::size_type;
  41     using difference_type = typename cont_type::difference_type;
  42     using iterator = typename cont_type::const_iterator;
  43     using const_iterator = typename cont_type::const_iterator;
  44
  45     /** Returns `true` if the container is empty. */
  46     bool
  47     empty() const
  48     {
  49         return m_cont.empty();
  50     }
  51
  52     /** Returns the number of items in the container. */
  53     size_type
  54     size() const
  55     {
  56         return m_cont.size();
  57     }
  58
  59     /** Returns forward iterators for traversal. */
  60     /** @{ */
  61     const_iterator
  62     begin() const
  63     {
  64         return m_cont.cbegin();
  65     }
  66
  67     const_iterator
  68     cbegin() const
  69     {
  70         return m_cont.cbegin();
  71     }
  72
  73     const_iterator
  74     end() const
  75     {
  76         return m_cont.cend();
  77     }
  78
  79     const_iterator
  80     cend() const
  81     {
  82         return m_cont.cend();
  83     }
  84     /** @} */
  85 };
  86
  87 } // detail
  88 } // unit_test
  89 } // beast
  90
  91 #endif