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/*
Copyright (c) Marshall Clow 2011-2012.
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 is_partitioned.hpp
/// \brief Tell if a sequence is partitioned
/// \author Marshall Clow
#ifndef BOOST_ALGORITHM_IS_PARTITIONED_HPP
#define BOOST_ALGORITHM_IS_PARTITIONED_HPP
#include <algorithm> // for std::is_partitioned, 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 is_partitioned if it is available
using std::is_partitioned; // Section 25.3.13
#else
/// \fn is_partitioned ( InputIterator first, InputIterator last, UnaryPredicate p )
/// \brief Tests to see if a sequence is partitioned according to a predicate
///
/// \param first The start of the input sequence
/// \param last One past the end of the input sequence
/// \param p The predicate to test the values with
/// \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 UnaryPredicate>
bool is_partitioned ( InputIterator first, InputIterator last, UnaryPredicate p )
{
// Run through the part that satisfy the predicate
for ( ; first != last; ++first )
if ( !p (*first))
break;
// Now the part that does not satisfy the predicate
for ( ; first != last; ++first )
if ( p (*first))
return false;
return true;
}
#endif
/// \fn is_partitioned ( const Range &r, UnaryPredicate p )
/// \brief Generates an increasing sequence of values, and stores them in the input Range.
///
/// \param r The input range
/// \param p The predicate to test the values with
///
template <typename Range, typename UnaryPredicate>
bool is_partitioned ( const Range &r, UnaryPredicate p )
{
return boost::algorithm::is_partitioned (boost::begin(r), boost::end(r), p);
}
}}
#endif // BOOST_ALGORITHM_IS_PARTITIONED_HPP
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