SharedInputView.hpp

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#pragma once
#include <ranges>
#include <memory>
#include <iterator>
 
namespace Thoth::Utils {
    template<std::ranges::input_range Range>
    struct SharedInputView {
        struct Iterator {
            using difference_type = std::ptrdiff_t;
            using value_type = std::ranges::range_value_t<Range>;
 
            SharedInputView* view = nullptr;
 
            [[nodiscard]] value_type operator*() const;
            Iterator& operator++();
            Iterator& operator++(int);
            [[nodiscard]] bool operator==(std::default_sentinel_t) const;
        };
 
        explicit SharedInputView(Range&& range);
 
        Iterator begin();
        static std::default_sentinel_t end();
 
    private:
        std::ranges::iterator_t<Range> _current;
        std::ranges::sentinel_t<Range> _end;
    };
}
 
#include <Thoth/Utils/Ranges/SharedInputView.tpp>
 
namespace Thoth::Utils {
    static_assert(std::ranges::range<SharedInputView<std::ranges::iota_view<int, int>>>);
}