.. _program_listing_file_src_rdf4cpp_query_QuadPattern.hpp:

Program Listing for File QuadPattern.hpp
========================================

|exhale_lsh| :ref:`Return to documentation for file <file_src_rdf4cpp_query_QuadPattern.hpp>` (``src/rdf4cpp/query/QuadPattern.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #ifndef RDF4CPP_QUADPATTERN_HPP
   #define RDF4CPP_QUADPATTERN_HPP
   
   #include <rdf4cpp/Node.hpp>
   #include <rdf4cpp/query/TriplePattern.hpp>
   
   #include <array>
   #include <ostream>
   
   namespace rdf4cpp::query {
   struct QuadPattern {
       using value_type = Node;
       using reference = value_type &;
       using const_reference = value_type const &;
       using pointer = value_type *;
       using const_pointer = value_type const *;
       using size_type = size_t;
       using difference_type = ptrdiff_t;
   
   protected:
       using storage_type = std::array<Node, 4>;
       storage_type entries_{};
   
   public:
       QuadPattern() noexcept = default;
       QuadPattern(Node graph, Node subject, Node predicate, Node object) noexcept;
   
       [[nodiscard]] reference graph() noexcept { return entries_[0]; }
       [[nodiscard]] const_reference graph() const noexcept { return entries_[0]; }
   
       [[nodiscard]] reference subject() noexcept { return entries_[1]; }
       [[nodiscard]] const_reference subject() const noexcept { return entries_[1]; }
   
       [[nodiscard]] reference predicate() noexcept { return entries_[2]; }
       [[nodiscard]] const_reference predicate() const noexcept { return entries_[2]; }
   
       [[nodiscard]] reference object() noexcept { return entries_[3]; }
       [[nodiscard]] const_reference object() const noexcept { return entries_[3]; }
   
       [[nodiscard]] reference operator[](size_type ix) noexcept { return entries_[ix]; }
       [[nodiscard]] const_reference operator[](size_type ix) const noexcept { return entries_[ix]; }
   
       [[nodiscard]] size_type size() const noexcept { return entries_.size(); }
   
       [[nodiscard]] bool valid() const noexcept;
   
       using iterator = typename storage_type::iterator;
       using const_iterator = typename storage_type::const_iterator;
       using reverse_iterator = typename storage_type::reverse_iterator;
       using const_reverse_iterator = typename storage_type::const_reverse_iterator;
   
       [[nodiscard]] iterator begin() noexcept { return entries_.begin(); }
       [[nodiscard]] const_iterator begin() const noexcept { return entries_.begin(); }
       [[nodiscard]] iterator end() noexcept { return entries_.end(); }
       [[nodiscard]] const_iterator end() const noexcept { return entries_.end(); }
       [[nodiscard]] reverse_iterator rbegin() noexcept { return entries_.rbegin(); }
       [[nodiscard]] const_reverse_iterator rbegin() const noexcept { return entries_.rbegin(); }
       [[nodiscard]] reverse_iterator rend() noexcept { return entries_.rend(); }
       [[nodiscard]] const_reverse_iterator rend() const noexcept { return entries_.rend(); }
   
       [[nodiscard]] TriplePattern const &without_graph() const noexcept;
   
       auto operator<=>(QuadPattern const &rhs) const = default;
   
       [[nodiscard]] explicit operator std::string() const;
       friend std::ostream &operator<<(std::ostream &os, QuadPattern const &pattern);
   
       [[nodiscard]] QuadPattern to_node_storage(storage::DynNodeStoragePtr node_storage) const;
       [[nodiscard]] QuadPattern try_get_in_node_storage(storage::DynNodeStoragePtr node_storage) const noexcept;
   };
   }  // namespace rdf4cpp::query
   
   #endif  //RDF4CPP_QUADPATTERN_HPP