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Diffstat (limited to 'boost/algorithm/cxx11/copy_if.hpp')
| -rw-r--r-- | boost/algorithm/cxx11/copy_if.hpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/boost/algorithm/cxx11/copy_if.hpp b/boost/algorithm/cxx11/copy_if.hpp new file mode 100644 index 0000000000..6d0ba00bae --- /dev/null +++ b/boost/algorithm/cxx11/copy_if.hpp @@ -0,0 +1,133 @@ +/* + 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 { + +#if __cplusplus >= 201103L +// Use the C++11 versions of copy_if if it is available +using std::copy_if; // Section 25.3.1 +#else +/// \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; +} +#endif + +/// \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 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> +OutputIterator copy_while ( InputIterator first, InputIterator last, + OutputIterator result, Predicate p ) +{ + for ( ; first != last && p(*first); ++first ) + *result++ = first; + return 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 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_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> +OutputIterator copy_until ( InputIterator first, InputIterator last, OutputIterator result, Predicate p ) +{ + for ( ; first != last && !p(*first); ++first ) + *result++ = first; + return 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> +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 |