ceph/src/boost/libs/range/include/boost/range/const_iterator.hpp

   1 // Boost.Range library
   2 //
   3 //  Copyright Thorsten Ottosen 2003-2004. Use, modification and
   4 //  distribution is subject to the Boost Software License, Version
   5 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 // For more information, see http://www.boost.org/libs/range/
   9 //
  10
  11 #ifndef BOOST_RANGE_CONST_ITERATOR_HPP
  12 #define BOOST_RANGE_CONST_ITERATOR_HPP
  13
  14 #if defined(_MSC_VER)
  15 # pragma once
  16 #endif
  17
  18 #include <boost/range/config.hpp>
  19
  20 #include <boost/range/range_fwd.hpp>
  21 #include <boost/range/detail/extract_optional_type.hpp>
  22 #include <boost/type_traits/remove_const.hpp>
  23 #include <boost/type_traits/remove_reference.hpp>
  24 #include <cstddef>
  25 #include <utility>
  26
  27 namespace boost
  28 {
  29     //////////////////////////////////////////////////////////////////////////
  30     // default
  31     //////////////////////////////////////////////////////////////////////////
  32
  33     namespace range_detail
  34     {
  35
  36 BOOST_RANGE_EXTRACT_OPTIONAL_TYPE( const_iterator )
  37
  38 template< typename C >
  39 struct range_const_iterator_helper
  40         : extract_const_iterator<C>
  41 {};
  42
  43 //////////////////////////////////////////////////////////////////////////
  44 // pair
  45 //////////////////////////////////////////////////////////////////////////
  46
  47 template< typename Iterator >
  48 struct range_const_iterator_helper<std::pair<Iterator,Iterator> >
  49 {
  50     typedef Iterator type;
  51 };
  52
  53 //////////////////////////////////////////////////////////////////////////
  54 // array
  55 //////////////////////////////////////////////////////////////////////////
  56
  57 template< typename T, std::size_t sz >
  58 struct range_const_iterator_helper< T[sz] >
  59 {
  60     typedef const T* type;
  61 };
  62
  63     } // namespace range_detail
  64
  65 template<typename C, typename Enabler=void>
  66 struct range_const_iterator
  67         : range_detail::range_const_iterator_helper<
  68             BOOST_DEDUCED_TYPENAME remove_reference<C>::type
  69         >
  70 {
  71 };
  72
  73 } // namespace boost
  74
  75
  76 #endif