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44 lines
1.4 KiB
ReStructuredText
44 lines
1.4 KiB
ReStructuredText
.. Copyright David Abrahams 2006. Distributed under the Boost
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.. Software License, Version 1.0. (See accompanying
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.. file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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Example
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.......
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This example fills an array with numbers and a second array with
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pointers into the first array, using ``counting_iterator`` for both
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tasks. Finally ``indirect_iterator`` is used to print out the numbers
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into the first array via indirection through the second array.
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::
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int N = 7;
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std::vector<int> numbers;
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typedef std::vector<int>::iterator n_iter;
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std::copy(boost::counting_iterator<int>(0),
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boost::counting_iterator<int>(N),
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std::back_inserter(numbers));
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std::vector<std::vector<int>::iterator> pointers;
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std::copy(boost::make_counting_iterator(numbers.begin()),
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boost::make_counting_iterator(numbers.end()),
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std::back_inserter(pointers));
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std::cout << "indirectly printing out the numbers from 0 to "
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<< N << std::endl;
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std::copy(boost::make_indirect_iterator(pointers.begin()),
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boost::make_indirect_iterator(pointers.end()),
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std::ostream_iterator<int>(std::cout, " "));
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std::cout << std::endl;
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The output is::
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indirectly printing out the numbers from 0 to 7
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0 1 2 3 4 5 6
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The source code for this example can be found `here`__.
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__ ../example/counting_iterator_example.cpp
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