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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 |