ceph/src/boost/boost/range/size.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_SIZE_HPP
  12 #define BOOST_RANGE_SIZE_HPP
  13
  14 #if defined(_MSC_VER)
  15 # pragma once
  16 #endif
  17
  18 #include <boost/range/config.hpp>
  19 #include <boost/range/begin.hpp>
  20 #include <boost/range/end.hpp>
  21 #include <boost/range/size_type.hpp>
  22 #include <boost/range/detail/has_member_size.hpp>
  23 #include <boost/assert.hpp>
  24 #include <boost/cstdint.hpp>
  25 #include <boost/utility.hpp>
  26
  27 namespace boost
  28 {
  29     namespace range_detail
  30     {
  31
  32         template<class SinglePassRange>
  33         inline typename ::boost::enable_if<
  34             has_member_size<SinglePassRange>,
  35             typename range_size<const SinglePassRange>::type
  36         >::type
  37         range_calculate_size(const SinglePassRange& rng)
  38         {
  39             return rng.size();
  40         }
  41
  42         template<class SinglePassRange>
  43         inline typename disable_if<
  44             has_member_size<SinglePassRange>,
  45             typename range_size<const SinglePassRange>::type
  46         >::type
  47         range_calculate_size(const SinglePassRange& rng)
  48         {
  49             return std::distance(boost::begin(rng), boost::end(rng));
  50         }
  51     }
  52
  53     template<class SinglePassRange>
  54     inline typename range_size<const SinglePassRange>::type
  55     size(const SinglePassRange& rng)
  56     {
  57 // Very strange things happen on some compilers that have the range concept
  58 // asserts disabled. This preprocessor condition is clearly redundant on a
  59 // working compiler but is vital for at least some compilers such as clang 4.2
  60 // but only on the Mac!
  61 #if BOOST_RANGE_ENABLE_CONCEPT_ASSERT == 1
  62         BOOST_RANGE_CONCEPT_ASSERT((boost::SinglePassRangeConcept<SinglePassRange>));
  63 #endif
  64
  65 #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) && \
  66     !BOOST_WORKAROUND(__GNUC__, < 3) \
  67     /**/
  68         using namespace range_detail;
  69 #endif
  70
  71         return range_calculate_size(rng);
  72     }
  73
  74 } // namespace 'boost'
  75
  76 #endif