alignment_matrix_column_major_range_base.hpp

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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2020, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2020, Knut Reinert & MPI für molekulare Genetik
// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
// -----------------------------------------------------------------------------------------------------
 
#pragma once
 
#include <seqan3/core/type_traits/basic.hpp>
#include <seqan3/core/type_traits/range.hpp>
#include <seqan3/std/iterator>
#include <seqan3/std/ranges>
#include <seqan3/std/span>
 
namespace seqan3::detail
{
 
template <typename derived_t>
class alignment_matrix_column_major_range_base
{
private:
    friend derived_t;
 
    class alignment_column_type : public std::ranges::view_interface<alignment_column_type>
    {
    private:
        using view_type = typename deferred_type<typename derived_t::column_data_view_type>::type;
 
        static_assert(std::ranges::random_access_range<view_type>, "Column view must support random access.");
        static_assert(std::ranges::sized_range<view_type>, "Column view must be a sized range.");
        static_assert(std::ranges::view<view_type>, "Column view must be a view.");
 
        using sentinel = std::ranges::sentinel_t<view_type>;
 
        class iterator_type
        {
        public:
 
            using value_type = typename deferred_type<typename derived_t::value_type>::type;
            using reference = typename deferred_type<typename derived_t::reference>::type;
            using pointer = void;
            using difference_type = std::ranges::range_difference_t<view_type>;
            using iterator_category = std::forward_iterator_tag;
 
            constexpr iterator_type() = default; 
            constexpr iterator_type(iterator_type const &) = default; 
            constexpr iterator_type(iterator_type &&) = default; 
            constexpr iterator_type & operator=(iterator_type const &) = default; 
            constexpr iterator_type & operator=(iterator_type &&) = default; 
            ~iterator_type() = default; 
 
            explicit constexpr iterator_type(alignment_column_type & host) :
                host_ptr{&host},
                host_iter{host.ref.begin()}
            {
                host_ptr->me_ptr->on_column_iterator_creation(host_iter);
            }
 
            constexpr reference operator*() const noexcept
            {
                static_assert(std::convertible_to<decltype(host_ptr->me_ptr->make_proxy(host_iter)), reference>,
                              "The returned type of make_proxy must be convertible to the reference type.");
                assert(host_ptr != nullptr);
                return host_ptr->me_ptr->make_proxy(host_iter);
            }
 
            constexpr iterator_type & operator++() noexcept
            {
                assert(host_ptr != nullptr);
                assert(host_ptr->me_ptr != nullptr);
 
                host_ptr->me_ptr->before_column_iterator_increment(host_iter);
                ++host_iter;
                host_ptr->me_ptr->after_column_iterator_increment(host_iter);
                return *this;
            }
 
            constexpr iterator_type operator++(int) noexcept
            {
                iterator_type tmp{*this};
                ++(*this);
                return tmp;
            }
 
            constexpr bool operator==(sentinel const & rhs) const noexcept
            {
                return host_iter == rhs;
            }
 
            friend constexpr bool operator==(sentinel const & lhs, iterator_type const & rhs) noexcept
            {
                return rhs == lhs;
            }
 
            constexpr bool operator==(iterator_type const & rhs) const noexcept
            {
                return (host_ptr == rhs.host_ptr) && (host_iter == rhs.host_iter);
            }
 
            constexpr bool operator!=(sentinel const & rhs) const noexcept
            {
                return !(*this == rhs);
            }
 
            friend constexpr bool operator!=(sentinel const & lhs, iterator_type const & rhs) noexcept
            {
                return rhs != lhs;
            }
 
            constexpr bool operator!=(iterator_type const & rhs) const noexcept
            {
                return !(*this == rhs);
            }
 
        private:
            alignment_column_type * host_ptr{nullptr};
            std::ranges::iterator_t<view_type> host_iter{};
        }; // class iterator_type
 
    public:
        constexpr alignment_column_type() = default; 
        constexpr alignment_column_type(alignment_column_type const &) = default; 
        constexpr alignment_column_type(alignment_column_type &&) = default; 
        constexpr alignment_column_type & operator=(alignment_column_type const &) = default; 
        constexpr alignment_column_type & operator=(alignment_column_type &&) = default; 
        ~alignment_column_type() = default; 
 
        constexpr alignment_column_type(derived_t & me, view_type ref) :
            ref{std::move(ref)},
            me_ptr{&me}
        {}
 
        constexpr iterator_type begin() noexcept
        {
            assert(me_ptr != nullptr);
            return iterator_type{*this};
        }
 
        constexpr auto begin() const noexcept = delete; // Not needed by the alignment algorithm
 
        constexpr sentinel end() noexcept
        {
            return ref.end();
        }
 
        constexpr sentinel end() const noexcept = delete; // Not needed by the alignment algorithm
 
        constexpr size_t size() const noexcept
        {
            return std::ranges::size(ref);
        }
 
    private:
        view_type ref{};
        derived_t * me_ptr{};
    }; // class alignment_column_type
 
    class iterator_type
    {
    public:
        using value_type = alignment_column_type;
        using reference = value_type;
        using pointer = void;
        using difference_type = std::ranges::range_difference_t<alignment_column_type>;
        using iterator_category = std::input_iterator_tag;
 
        constexpr iterator_type() = default; 
        constexpr iterator_type(iterator_type const &) = default; 
        constexpr iterator_type(iterator_type &&) = default; 
        constexpr iterator_type & operator=(iterator_type const &) = default; 
        constexpr iterator_type & operator=(iterator_type &&) = default; 
        ~iterator_type() = default; 
 
        explicit constexpr iterator_type(derived_t & me) :
            me_ptr{&me},
            column_index{0}
        {}
 
        constexpr reference operator*() const noexcept
        {
            static_assert(std::convertible_to<decltype(me_ptr->initialise_column(column_index)), reference>,
                          "The returned type of initialise_column must be convertible to the reference type.");
            return me_ptr->initialise_column(column_index);
        }
 
        constexpr iterator_type & operator++() noexcept
        {
            ++column_index;
            return *this;
        }
 
        constexpr void operator++(int) noexcept
        {
            ++(*this);
        }
 
        constexpr bool operator==(std::default_sentinel_t const &) const noexcept
        {
            return column_index == me_ptr->num_cols;
        }
 
        friend constexpr bool operator==(std::default_sentinel_t const & lhs, iterator_type const & rhs)
            noexcept
        {
            return rhs == lhs;
        }
 
        constexpr bool operator!=(std::default_sentinel_t const & rhs) const noexcept
        {
            return !(*this == rhs);
        }
 
        friend constexpr bool operator!=(std::default_sentinel_t const & lhs, iterator_type const & rhs)
            noexcept
        {
            return rhs != lhs;
        }
 
    private:
        derived_t * me_ptr;
        size_t column_index{};
    }; // class iterator_type
 
    constexpr alignment_matrix_column_major_range_base() = default;
    constexpr alignment_matrix_column_major_range_base(alignment_matrix_column_major_range_base const &) = default;
    constexpr alignment_matrix_column_major_range_base(alignment_matrix_column_major_range_base &&) = default;
    constexpr alignment_matrix_column_major_range_base &
    operator=(alignment_matrix_column_major_range_base const &) = default;
    constexpr alignment_matrix_column_major_range_base &
    operator=(alignment_matrix_column_major_range_base &&) = default;
    ~alignment_matrix_column_major_range_base() = default;
 
    SEQAN3_DOXYGEN_ONLY(typedef /*IMPLEMENTATION_DEFINED*/ value_type;)
 
    SEQAN3_DOXYGEN_ONLY(typedef /*IMPLEMENTATION_DEFINED*/ column_data_view_type;)
 
    SEQAN3_DOXYGEN_ONLY(value_type make_proxy(iter_t host_iter) noexcept {})
 
    SEQAN3_DOXYGEN_ONLY(alignment_column_type initialise_column(size_t column_index) {})
 
    template <typename iter_t>
    constexpr void on_column_iterator_creation(iter_t SEQAN3_DOXYGEN_ONLY(host_iter)) noexcept
    {}
 
    template <typename iter_t>
    constexpr void before_column_iterator_increment(iter_t SEQAN3_DOXYGEN_ONLY(host_iter)) noexcept
    {}
 
    template <typename iter_t>
    constexpr void after_column_iterator_increment(iter_t SEQAN3_DOXYGEN_ONLY(host_iter)) noexcept
    {}
 
    using iterator = iterator_type;
    using sentinel = std::default_sentinel_t;
 
public:
    constexpr iterator begin() noexcept
    {
        return iterator{static_cast<derived_t &>(*this)};
    }
 
    constexpr iterator begin() const noexcept = delete; // not needed for the alignment algorithm
 
    constexpr sentinel end() noexcept
    {
        return std::default_sentinel;
    }
 
    constexpr sentinel end() const noexcept = delete; // not needed for the alignment algorithm
};
} // namespace seqan3::detail