is_heap.h

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#pragma once
 
#include "di/container/algorithm/is_heap_until.h"
#include "di/container/concepts/prelude.h"
#include "di/container/meta/prelude.h"
#include "di/function/compare.h"
#include "di/function/identity.h"
#include "di/util/move.h"
#include "di/util/reference_wrapper.h"
 
namespace di::container {
namespace detail {
    struct IsHeapFunction {
        template<concepts::RandomAccessIterator Iter, concepts::SentinelFor<Iter> Sent,
                 typename Proj = function::Identity,
                 concepts::IndirectStrictWeakOrder<meta::Projected<Iter, Proj>> Comp = function::Compare>
        constexpr auto operator()(Iter first, Sent last, Comp comp = {}, Proj proj = {}) const -> bool {
            return container::is_heap_until(util::move(first), last, util::ref(comp), util::ref(proj)) == last;
        }
 
        template<concepts::RandomAccessContainer Con, typename Proj = function::Identity,
                 concepts::IndirectStrictWeakOrder<meta::Projected<meta::ContainerIterator<Con>, Proj>> Comp =
                     function::Compare>
        constexpr auto operator()(Con&& container, Comp comp = {}, Proj proj = {}) const -> bool {
            return (*this)(container::begin(container), container::end(container), util::ref(comp), util::ref(proj));
        }
    };
}
 
constexpr inline auto is_heap = detail::IsHeapFunction {};
}
 
namespace di {
using container::is_heap;
}