54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
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// Copyright Neil Groves 2009. 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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//
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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_ALGORITHM_COPY_N_HPP_INCLUDED
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#define BOOST_RANGE_ALGORITHM_COPY_N_HPP_INCLUDED
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#include <boost/assert.hpp>
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#include <boost/concept_check.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/concepts.hpp>
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#include <boost/range/distance.hpp>
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#include <boost/range/iterator.hpp>
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#include <boost/range/iterator_range.hpp>
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#include <algorithm>
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namespace boost
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{
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namespace range
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{
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/// \brief template function copy
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///
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/// range-based version of the copy std algorithm
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///
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/// \pre SinglePassRange is a model of the SinglePassRangeConcept
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/// \pre OutputIterator is a model of the OutputIteratorConcept
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/// \pre 0 <= n < distance(rng)
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template< class SinglePassRange, class Size, class OutputIterator >
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inline OutputIterator copy_n(const SinglePassRange& rng, Size n, OutputIterator out)
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{
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BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
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BOOST_ASSERT( n < static_cast<Size>(boost::distance(rng)) );
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BOOST_ASSERT( n >= static_cast<Size>(0) );
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BOOST_DEDUCED_TYPENAME range_iterator<const SinglePassRange>::type source = boost::begin(rng);
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for (Size i = 0; i < n; ++i, ++out, ++source)
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*out = *source;
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return out;
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}
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} // namespace range
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using range::copy_n;
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} // namespace boost
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#endif // include guard
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