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074007ab8c
the adaptors, allowing default construction of UnaryFunction and Predicate arguments when they are class types. [SVN r19081]
97 lines
2.7 KiB
C++
97 lines
2.7 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 <vector>
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#include <iostream>
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#include <iterator>
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#include <functional>
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#include <algorithm>
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#include <boost/iterator/indirect_iterator.hpp>
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#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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namespace boost { namespace detail
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{
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template <>
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struct iterator_traits<char*>
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: ptr_iter_traits<char>
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{
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};
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template <>
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struct iterator_traits<char const*>
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: ptr_iter_traits<char, char const>
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{
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};
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template <>
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struct iterator_traits<char**>
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: ptr_iter_traits<char*>
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{
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};
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template <>
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struct iterator_traits<char const* const*>
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: ptr_iter_traits<char const*, char const* const>
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{
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};
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template <>
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struct iterator_traits<char* const*>
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: ptr_iter_traits<char*, char* const>
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{
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};
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}}
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#endif
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int main(int, char*[])
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{
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char characters[] = "abcdefg";
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const int N = sizeof(characters)/sizeof(char) - 1; // -1 since characters has a null char
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char* pointers_to_chars[N]; // at the end.
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for (int i = 0; i < N; ++i)
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pointers_to_chars[i] = &characters[i];
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// Example of using indirect_iterator_generator
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boost::indirect_iterator<char**, char>
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indirect_first(pointers_to_chars), indirect_last(pointers_to_chars + N);
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std::copy(indirect_first, indirect_last, std::ostream_iterator<char>(std::cout, ","));
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std::cout << std::endl;
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// Example of using indirect_iterator_pair_generator
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char mutable_characters[N];
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char* pointers_to_mutable_chars[N];
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for (int j = 0; j < N; ++j)
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pointers_to_mutable_chars[j] = &mutable_characters[j];
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boost::indirect_iterator<char* const*> mutable_indirect_first(pointers_to_mutable_chars),
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mutable_indirect_last(pointers_to_mutable_chars + N);
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boost::indirect_iterator<char const* const*> const_indirect_first(pointers_to_chars),
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const_indirect_last(pointers_to_chars + N);
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std::transform(const_indirect_first, const_indirect_last,
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mutable_indirect_first, std::bind1st(std::plus<char>(), 1));
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std::copy(mutable_indirect_first, mutable_indirect_last,
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std::ostream_iterator<char>(std::cout, ","));
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std::cout << std::endl;
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// Example of using make_indirect_iterator()
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#if !defined(BOOST_MSVC) || BOOST_MSVC > 1300
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std::copy(boost::make_indirect_iterator(pointers_to_chars),
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boost::make_indirect_iterator(pointers_to_chars + N),
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std::ostream_iterator<char>(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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