is_sorted_until.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_IS_SORTED_UNTIL_HPP
#define RANGES_V3_ALGORITHM_IS_SORTED_UNTIL_HPP
 
#include <range/v3/range_fwd.hpp>
 
#include <range/v3/functional/comparisons.hpp>
#include <range/v3/functional/identity.hpp>
#include <range/v3/functional/invoke.hpp>
#include <range/v3/iterator/concepts.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(is_sorted_until)
        template(typename I, typename S, typename R = less, typename P = identity)(
            requires forward_iterator<I> AND sentinel_for<S, I> AND
            indirect_strict_weak_order<R, projected<I, P>>)
        constexpr I RANGES_FUNC(is_sorted_until)(I first, S last, R pred = R{}, P proj = P{})
        {
            auto i = first;
            if(first != last)
            {
                while(++i != last)
                {
                    if(invoke(pred, invoke(proj, *i), invoke(proj, *first)))
                        return i;
                    first = i;
                }
            }
            return i;
        }

        template(typename Rng, typename R = less, typename P = identity)(
            requires forward_range<Rng> AND
            indirect_strict_weak_order<R, projected<iterator_t<Rng>, P>>)
        constexpr borrowed_iterator_t<Rng> //
        RANGES_FUNC(is_sorted_until)(Rng && rng, R pred = R{}, P proj = P{})
        {
            return (*this)(begin(rng), end(rng), std::move(pred), std::move(proj));
        }
 
    RANGES_FUNC_END(is_sorted_until)
 
    namespace cpp20
    {
        using ranges::is_sorted_until;
    }
} // namespace ranges
 
#include <range/v3/detail/epilogue.hpp>
 
#endif