Merge Boost.Algorithm to release branch

[SVN r78025]

include/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