forked from boostorg/utility
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
// (C) Copyright Jeremy Siek 2000. Permission to copy, use, modify, sell and
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// distribute this software is granted provided this copyright notice appears
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// in all copies. This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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#include <boost/config.hpp>
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#include <iostream>
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#include <iterator>
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#include <vector>
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#include <boost/counting_iterator.hpp>
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#include <boost/iterator_adaptors.hpp>
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int main(int, char*[])
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{
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// Example of using counting_iterator_generator
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std::cout << "counting from 0 to 4:" << std::endl;
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boost::counting_iterator_generator<int>::type 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 make_counting_iterator()
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std::cout << "counting from -5 to 4:" << std::endl;
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std::copy(boost::make_counting_iterator(-5),
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boost::make_counting_iterator(5),
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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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const int N = 7;
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std::vector<int> numbers;
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// Fill "numbers" array with [0,N)
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std::copy(boost::make_counting_iterator(0), boost::make_counting_iterator(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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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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#ifndef BOOST_MSVC
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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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#endif
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return 0;
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}
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