Chris@16: //  Copyright Neil Groves 2009. Use, modification and
Chris@16: //  distribution is subject to the Boost Software License, Version
Chris@16: //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: //
Chris@16: // For more information, see http://www.boost.org/libs/range/
Chris@16: //
Chris@16: #ifndef BOOST_RANGE_ALGORITHM_COPY_N_HPP_INCLUDED
Chris@16: #define BOOST_RANGE_ALGORITHM_COPY_N_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/concept_check.hpp>
Chris@16: #include <boost/range/begin.hpp>
Chris@16: #include <boost/range/end.hpp>
Chris@16: #include <boost/range/concepts.hpp>
Chris@16: #include <boost/range/distance.hpp>
Chris@16: #include <boost/range/iterator.hpp>
Chris@16: #include <boost/range/iterator_range.hpp>
Chris@16: #include <algorithm>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace range
Chris@16:     {
Chris@16: 
Chris@16: /// \brief template function copy
Chris@16: ///
Chris@16: /// range-based version of the copy std algorithm
Chris@16: ///
Chris@16: /// \pre SinglePassRange is a model of the SinglePassRangeConcept
Chris@16: /// \pre OutputIterator is a model of the OutputIteratorConcept
Chris@16: /// \pre 0 <= n <= distance(rng)
Chris@16: template< class SinglePassRange, class Size, class OutputIterator >
Chris@16: inline OutputIterator copy_n(const SinglePassRange& rng, Size n, OutputIterator out)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
Chris@16:     BOOST_ASSERT( n <= static_cast<Size>(::boost::distance(rng)) );
Chris@16:     BOOST_ASSERT( n >= static_cast<Size>(0) );
Chris@16: 
Chris@16:     BOOST_DEDUCED_TYPENAME range_iterator<const SinglePassRange>::type source = ::boost::begin(rng);
Chris@16: 
Chris@16:     for (Size i = 0; i < n; ++i, ++out, ++source)
Chris@16:         *out = *source;
Chris@16: 
Chris@16:     return out;
Chris@16: }
Chris@16: 
Chris@16:     } // namespace range
Chris@16:     using ::boost::range::copy_n;
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // include guard