53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
// (C) Copyright Jeremy Siek 2000-2004.
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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#include <boost/config.hpp>
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#include <algorithm>
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#include <iostream>
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#include <iterator>
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#include <vector>
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#include <boost/iterator/counting_iterator.hpp>
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#include <boost/iterator/indirect_iterator.hpp>
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#include <boost/cstdlib.hpp>
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int main(int, char*[])
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{
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// Example of using counting_iterator
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std::cout << "counting from 0 to 4:" << std::endl;
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boost::counting_iterator<int> first(0), last(4);
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std::copy(first, last, std::ostream_iterator<int>(std::cout, " "));
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std::cout << std::endl;
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// Example of using counting iterator to create an array of pointers.
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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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// Fill "numbers" array with [0,N)
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std::copy(
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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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// Use counting iterator to fill in the array of pointers.
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// causes an ICE with MSVC6
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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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// Use indirect iterator to print out numbers by accessing
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// them through the array of 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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return boost::exit_success;
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}
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