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/// \file
// Range v3 library
//
// Copyright Eric Niebler 2013-present
// Copyright Gonzalo Brito Gadeschi 2014
//
// Use, modification and distribution is subject to 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)
//
// Project home: https://github.com/ericniebler/range-v3
//
// Implementation based on the code in libc++
// http://http://libcxx.llvm.org/
#ifndef RANGES_V3_ALGORITHM_UNIQUE_HPP
#define RANGES_V3_ALGORITHM_UNIQUE_HPP
#include <range/v3/range_fwd.hpp>
#include <range/v3/algorithm/adjacent_find.hpp>
#include <range/v3/functional/comparisons.hpp>
#include <range/v3/functional/identity.hpp>
#include <range/v3/functional/invoke.hpp>
#include <range/v3/iterator/operations.hpp>
#include <range/v3/range/access.hpp>
#include <range/v3/range/concepts.hpp>
#include <range/v3/range/dangling.hpp>
#include <range/v3/range/traits.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/detail/prologue.hpp>
namespace ranges
{
/// \addtogroup group-algorithms
/// @{
RANGES_FUNC_BEGIN(unique)
/// \brief template function \c unique
///
/// range-based version of the \c unique std algorithm
///
/// \pre `Rng` is a model of the `forward_range` concept
/// \pre `I` is a model of the `forward_iterator` concept
/// \pre `S` is a model of the `sentinel_for` concept
/// \pre `C` is a model of the `relation` concept
///
template(typename I, typename S, typename C = equal_to, typename P = identity)(
requires sortable<I, C, P> AND sentinel_for<S, I>)
constexpr I RANGES_FUNC(unique)(I first, S last, C pred = C{}, P proj = P{})
{
first = adjacent_find(std::move(first), last, ranges::ref(pred), ranges::ref(proj));
if(first != last)
{
for(I i = next(first); ++i != last;)
if(!invoke(pred, invoke(proj, *first), invoke(proj, *i)))
*++first = iter_move(i);
++first;
}
return first;
}
/// \overload
template(typename Rng, typename C = equal_to, typename P = identity)(
requires sortable<iterator_t<Rng>, C, P> AND range<Rng>)
constexpr borrowed_iterator_t<Rng> //
RANGES_FUNC(unique)(Rng && rng, C pred = C{}, P proj = P{}) //
{
return (*this)(begin(rng), end(rng), std::move(pred), std::move(proj));
}
RANGES_FUNC_END(unique)
namespace cpp20
{
using ranges::unique;
}
/// @}
} // namespace ranges
#include <range/v3/detail/epilogue.hpp>
#endif
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