| /* |
| Copyright (c) Marshall Clow 2008-2012. |
| |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| */ |
| |
| /// \file copy_if.hpp |
| /// \brief Copy a subset of a sequence to a new sequence |
| /// \author Marshall Clow |
| |
| #ifndef BOOST_ALGORITHM_COPY_IF_HPP |
| #define BOOST_ALGORITHM_COPY_IF_HPP |
| |
| #include <algorithm> // for std::copy_if, if available |
| #include <boost/range/begin.hpp> |
| #include <boost/range/end.hpp> |
| |
| namespace boost { namespace algorithm { |
| |
| /// \fn copy_if ( InputIterator first, InputIterator last, OutputIterator result, Predicate p ) |
| /// \brief Copies all the elements from the input range that satisfy the |
| /// predicate to the output range. |
| /// \return The updated output iterator |
| /// |
| /// \param first The start of the input sequence |
| /// \param last One past the end of the input sequence |
| /// \param result An output iterator to write the results into |
| /// \param p A predicate for testing the elements of the range |
| /// \note This function is part of the C++2011 standard library. |
| /// We will use the standard one if it is available, |
| /// otherwise we have our own implementation. |
| template<typename InputIterator, typename OutputIterator, typename Predicate> |
| OutputIterator copy_if ( InputIterator first, InputIterator last, OutputIterator result, Predicate p ) |
| { |
| for ( ; first != last; ++first ) |
| if (p(*first)) |
| *result++ = *first; |
| return result; |
| } |
| |
| /// \fn copy_if ( const Range &r, OutputIterator result, Predicate p ) |
| /// \brief Copies all the elements from the input range that satisfy the |
| /// predicate to the output range. |
| /// \return The updated output iterator |
| /// |
| /// \param r The input range |
| /// \param result An output iterator to write the results into |
| /// \param p A predicate for testing the elements of the range |
| /// |
| template<typename Range, typename OutputIterator, typename Predicate> |
| OutputIterator copy_if ( const Range &r, OutputIterator result, Predicate p ) |
| { |
| return boost::algorithm::copy_if (boost::begin (r), boost::end(r), result, p); |
| } |
| |
| |
| /// \fn copy_while ( InputIterator first, InputIterator last, OutputIterator result, Predicate p ) |
| /// \brief Copies all the elements at the start of the input range that |
| /// satisfy the predicate to the output range. |
| /// \return The updated input and output iterators |
| /// |
| /// \param first The start of the input sequence |
| /// \param last One past the end of the input sequence |
| /// \param result An output iterator to write the results into |
| /// \param p A predicate for testing the elements of the range |
| /// |
| template<typename InputIterator, typename OutputIterator, typename Predicate> |
| std::pair<InputIterator, OutputIterator> |
| copy_while ( InputIterator first, InputIterator last, OutputIterator result, Predicate p ) |
| { |
| for ( ; first != last && p(*first); ++first ) |
| *result++ = *first; |
| return std::make_pair(first, result); |
| } |
| |
| /// \fn copy_while ( const Range &r, OutputIterator result, Predicate p ) |
| /// \brief Copies all the elements at the start of the input range that |
| /// satisfy the predicate to the output range. |
| /// \return The updated input and output iterators |
| /// |
| /// \param r The input range |
| /// \param result An output iterator to write the results into |
| /// \param p A predicate for testing the elements of the range |
| /// |
| template<typename Range, typename OutputIterator, typename Predicate> |
| std::pair<typename boost::range_iterator<const Range>::type, OutputIterator> |
| copy_while ( const Range &r, OutputIterator result, Predicate p ) |
| { |
| return boost::algorithm::copy_while (boost::begin (r), boost::end(r), result, p); |
| } |
| |
| |
| /// \fn copy_until ( InputIterator first, InputIterator last, OutputIterator result, Predicate p ) |
| /// \brief Copies all the elements at the start of the input range that do not |
| /// satisfy the predicate to the output range. |
| /// \return The updated output iterator |
| /// |
| /// \param first The start of the input sequence |
| /// \param last One past the end of the input sequence |
| /// \param result An output iterator to write the results into |
| /// \param p A predicate for testing the elements of the range |
| /// |
| template<typename InputIterator, typename OutputIterator, typename Predicate> |
| std::pair<InputIterator, OutputIterator> |
| copy_until ( InputIterator first, InputIterator last, OutputIterator result, Predicate p ) |
| { |
| for ( ; first != last && !p(*first); ++first ) |
| *result++ = *first; |
| return std::make_pair(first, result); |
| } |
| |
| /// \fn copy_until ( const Range &r, OutputIterator result, Predicate p ) |
| /// \brief Copies all the elements at the start of the input range that do not |
| /// satisfy the predicate to the output range. |
| /// \return The updated output iterator |
| /// |
| /// \param r The input range |
| /// \param result An output iterator to write the results into |
| /// \param p A predicate for testing the elements of the range |
| /// |
| template<typename Range, typename OutputIterator, typename Predicate> |
| std::pair<typename boost::range_iterator<const Range>::type, OutputIterator> |
| copy_until ( const Range &r, OutputIterator result, Predicate p ) |
| { |
| return boost::algorithm::copy_until (boost::begin (r), boost::end(r), result, p); |
| } |
| |
| }} // namespace boost and algorithm |
| |
| #endif // BOOST_ALGORITHM_COPY_IF_HPP |