77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
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// Boost.Range library
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//
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// Copyright Thorsten Ottosen 2003-2004. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// For more information, see http://www.boost.org/libs/range/
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//
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#ifndef BOOST_RANGE_SIZE_HPP
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#define BOOST_RANGE_SIZE_HPP
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/range/config.hpp>
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#include <boost/range/begin.hpp>
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#include <boost/range/end.hpp>
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#include <boost/range/size_type.hpp>
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#include <boost/range/detail/has_member_size.hpp>
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#include <boost/assert.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/utility.hpp>
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namespace boost
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{
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namespace range_detail
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{
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template<class SinglePassRange>
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inline typename ::boost::enable_if<
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has_member_size<SinglePassRange>,
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typename range_size<const SinglePassRange>::type
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>::type
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range_calculate_size(const SinglePassRange& rng)
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{
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return rng.size();
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}
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template<class SinglePassRange>
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inline typename disable_if<
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has_member_size<SinglePassRange>,
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typename range_size<const SinglePassRange>::type
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>::type
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range_calculate_size(const SinglePassRange& rng)
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{
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return std::distance(boost::begin(rng), boost::end(rng));
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}
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}
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template<class SinglePassRange>
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inline typename range_size<const SinglePassRange>::type
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size(const SinglePassRange& rng)
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{
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// Very strange things happen on some compilers that have the range concept
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// asserts disabled. This preprocessor condition is clearly redundant on a
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// working compiler but is vital for at least some compilers such as clang 4.2
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// but only on the Mac!
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#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT == 1
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BOOST_RANGE_CONCEPT_ASSERT((boost::SinglePassRangeConcept<SinglePassRange>));
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#endif
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#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) && \
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!BOOST_WORKAROUND(__GNUC__, < 3) \
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/**/
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using namespace range_detail;
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#endif
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return range_calculate_size(rng);
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}
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} // namespace 'boost'
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#endif
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