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1 | // Copyright Neil Groves 2009. Use, modification and |
2 | // distribution is subject to the Boost Software License, Version | |
3 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
4 | // http://www.boost.org/LICENSE_1_0.txt) | |
5 | // | |
6 | // | |
7 | // For more information, see http://www.boost.org/libs/range/ | |
8 | // | |
9 | #ifndef BOOST_RANGE_ALGORITHM_COPY_N_HPP_INCLUDED | |
10 | #define BOOST_RANGE_ALGORITHM_COPY_N_HPP_INCLUDED | |
11 | ||
12 | #include <boost/assert.hpp> | |
13 | #include <boost/concept_check.hpp> | |
14 | #include <boost/range/begin.hpp> | |
15 | #include <boost/range/end.hpp> | |
16 | #include <boost/range/concepts.hpp> | |
17 | #include <boost/range/distance.hpp> | |
18 | #include <boost/range/iterator.hpp> | |
19 | #include <boost/range/iterator_range.hpp> | |
20 | #include <algorithm> | |
21 | ||
22 | namespace boost | |
23 | { | |
24 | namespace range | |
25 | { | |
26 | ||
27 | /// \brief template function copy | |
28 | /// | |
29 | /// range-based version of the copy std algorithm | |
30 | /// | |
31 | /// \pre SinglePassRange is a model of the SinglePassRangeConcept | |
32 | /// \pre OutputIterator is a model of the OutputIteratorConcept | |
33 | /// \pre 0 <= n <= distance(rng) | |
34 | template< class SinglePassRange, class Size, class OutputIterator > | |
35 | inline OutputIterator copy_n(const SinglePassRange& rng, Size n, OutputIterator out) | |
36 | { | |
37 | BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> )); | |
38 | BOOST_ASSERT( n <= static_cast<Size>(::boost::distance(rng)) ); | |
39 | BOOST_ASSERT( n >= static_cast<Size>(0) ); | |
40 | ||
41 | BOOST_DEDUCED_TYPENAME range_iterator<const SinglePassRange>::type source = ::boost::begin(rng); | |
42 | ||
43 | for (Size i = 0; i < n; ++i, ++out, ++source) | |
44 | *out = *source; | |
45 | ||
46 | return out; | |
47 | } | |
48 | ||
49 | } // namespace range | |
50 | using ::boost::range::copy_n; | |
51 | } // namespace boost | |
52 | ||
53 | #endif // include guard |