| 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(BOOST_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 |
| 77 |