libboost-stl-interfaces/1.87.0

An updated C++20-friendly version of the iterator_facade and iterator_adaptor parts of Boost.Iterator (now called iterator_interface); a pre-C++20 version of C++20's view_interface; and a new template called container_interface, meant to aid the creation of new containers; all targeting standardization. This library requires at least C++14.

For the iterator portion -- if you need to write an iterator, iterator_interface turns this:

    struct repeated_chars_iterator
    {
        using value_type = char;
        using difference_type = std::ptrdiff_t;
        using pointer = char const *;
        using reference = char const;
        using iterator_category = std::random_access_iterator_tag;

        constexpr repeated_chars_iterator() noexcept :
            first_(nullptr),
            size_(0),
            n_(0)
        {}
        constexpr repeated_chars_iterator(
            char const * first,
            difference_type size,
            difference_type n) noexcept :
            first_(first),
            size_(size),
            n_(n)
        {}

        constexpr reference operator*() const noexcept
        {
            return first_[n_ % size_];
        }

        constexpr value_type operator[](difference_type n) const noexcept
        {
            return first_[(n_ + n) % size_];
        }

        constexpr repeated_chars_iterator & operator++() noexcept
        {
            ++n_;
            return *this;
        }
        constexpr repeated_chars_iterator operator++(int)noexcept
        {
            repeated_chars_iterator retval = *this;
            ++*this;
            return retval;
        }
        constexpr repeated_chars_iterator & operator+=(difference_type n) noexcept
        {
            n_ += n;
            return *this;
        }

        constexpr repeated_chars_iterator & operator--() noexcept
        {
            --n_;
            return *this;
        }
        constexpr repeated_chars_iterator operator--(int)noexcept
        {
            repeated_chars_iterator retval = *this;
            --*this;
            return retval;
        }
        constexpr repeated_chars_iterator & operator-=(difference_type n) noexcept
        {
            n_ -= n;
            return *this;
        }

        friend constexpr bool operator==(
            repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
        {
            return lhs.first_ == rhs.first_ && lhs.n_ == rhs.n_;
        }
        friend constexpr bool operator!=(
            repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
        {
            return !(lhs == rhs);
        }
        friend constexpr bool operator<(
            repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
        {
            return lhs.first_ == rhs.first_ && lhs.n_ < rhs.n_;
        }
        friend constexpr bool operator<=(
            repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
        {
            return lhs == rhs || lhs < rhs;
        }
        friend constexpr bool operator>(
            repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
        {
            return rhs < lhs;
        }
        friend constexpr bool operator>=(
            repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
        {
            return rhs <= lhs;
        }

        friend constexpr repeated_chars_iterator
        operator+(repeated_chars_iterator lhs, difference_type rhs) noexcept
        {
            return lhs += rhs;
        }
        friend constexpr repeated_chars_iterator
        operator+(difference_type lhs, repeated_chars_iterator rhs) noexcept
        {
            return rhs += lhs;
        }
        friend constexpr repeated_chars_iterator
        operator-(repeated_chars_iterator lhs, difference_type rhs) noexcept
        {
            return lhs -= rhs;
        }
        friend constexpr difference_type operator-(
            repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
        {
            return lhs.n_ - rhs.n_;
        }

    private:
        char const * first_;
        difference_type size_;
        difference_type n_;
    };