sentinel_extension.h

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#pragma once
 
#include "di/container/concepts/prelude.h"
#include "di/container/iterator/sentinel_base.h"
#include "di/container/meta/prelude.h"
 
namespace di::container {
template<typename Self, typename Sent, typename WrappedIter, concepts::Iterator Iter>
requires(concepts::SentinelFor<Sent, Iter>)
class SentinelExtension : public SentinelBase<Self> {
public:
    SentinelExtension() = default;
 
    constexpr explicit SentinelExtension(Sent base) : m_base(base) {}
 
    constexpr auto base() const -> Sent { return m_base; }
 
    constexpr auto difference(WrappedIter const& a) const
    requires(concepts::SizedSentinelFor<Sent, Iter>)
    {
        return this->base() - a.base();
    }
 
private:
    constexpr friend auto operator==(Self const& a, WrappedIter const& b) -> bool { return a.base() == b.base(); }
 
    Sent m_base;
};
}