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// Copyright (c) 2013 Kyle Lutz <>
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// See for more information.


#include <boost/static_assert.hpp>

#include <boost/compute/lambda.hpp>
#include <boost/compute/system.hpp>
#include <boost/compute/command_queue.hpp>
#include <boost/compute/algorithm/detail/binary_find.hpp>
#include <boost/compute/type_traits/is_device_iterator.hpp>

namespace boost {
namespace compute {

/// Returns an iterator pointing to the first element in the sorted
/// range [\p first, \p last) that is not less than \p value.
/// Space complexity: \Omega(1)
/// \see upper_bound()
template<class InputIterator, class T>
inline InputIterator
lower_bound(InputIterator first,
            InputIterator last,
            const T &value,
            command_queue &queue = system::default_queue())
    using ::boost::compute::_1;

    InputIterator position =
        detail::binary_find(first, last, _1 >= value, queue);

    return position;

} // end compute namespace
} // end boost namespace