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/*
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 <utility> // for std::pair, std::make_pair
#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.
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
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