unique.hpp

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// 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
{
    RANGES_FUNC_BEGIN(unique)
 
        
        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;
        }

        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