schema progress (does not compile)

include/matador/object/internal/observer_list_copy_creator.hpp

@@ -0,0 +1,57 @@
+#ifndef MATADOR_OBSERVER_LIST_COPY_CREATOR_HPP
+#define MATADOR_OBSERVER_LIST_COPY_CREATOR_HPP
+
+#include "matador/object/observer.hpp"
+
+#include <memory>
+#include <vector>
+
+namespace matador::object::internal {
+template <typename SourceType, typename DestType, template <typename> class... ObserverType>
+class observer_list_copy_creator
+{
+public:
+  using source_observer_vector = std::vector<std::unique_ptr<observer<SourceType>>>;
+  using observer_vector = std::vector<std::unique_ptr<observer<DestType>>>;
+  using iterator = typename observer_vector::iterator;
+
+  static observer_vector copy_create(const source_observer_vector &source_observers) {
+    observer_list_copy_creator creator(source_observers);
+
+    return std::move(creator.observers_);
+  }
+
+private:
+  explicit observer_list_copy_creator(const source_observer_vector &source_observers)
+  : source_observers_(source_observers) {
+    if constexpr (sizeof...(ObserverType) != 0) {
+      copy_observer<ObserverType...>();
+    }
+  }
+
+  template <template <typename> class FirstObserverType>
+  void copy_observer() {
+    try_copy_observer<FirstObserverType>();
+  }
+
+  template <template <typename> class FirstObserverType, template <typename> class NextObserverType, template <typename> class... RestObserverType>
+  void copy_observer() {
+    try_copy_observer<FirstObserverType>();
+    copy_observer<NextObserverType, RestObserverType...>();
+  }
+
+  template <template <typename> class CurrentObserverType>
+  void try_copy_observer() {
+    for ( const auto &obs : source_observers_ ) {;
+      if (const auto *casted_observer = dynamic_cast<const CurrentObserverType<SourceType>*>(obs.get()); casted_observer != nullptr) {
+        observers_.emplace_back(std::make_unique<CurrentObserverType<DestType>>(*casted_observer));
+        break;
+      }
+    }
+  }
+private:
+  const source_observer_vector &source_observers_;
+  observer_vector observers_;
+};
+}
+#endif //MATADOR_OBSERVER_LIST_COPY_CREATOR_HPP

include/matador/object/internal/observer_list_creator.hpp

@@ -0,0 +1,69 @@
+#ifndef MATADOR_OBSERVER_LIST_CREATOR_HPP
+#define MATADOR_OBSERVER_LIST_CREATOR_HPP
+
+#include "matador/object/observer.hpp"
+
+#include <memory>
+#include <vector>
+
+namespace matador::object::internal {
+template <typename Type, template <typename> class... ObserverType>
+class observer_list_creator
+{
+public:
+  using observer_vector = std::vector<std::unique_ptr<observer<Type>>>;
+
+  static void create_missing(observer_vector &observers) {
+    observer_list_creator creator(observers);
+  }
+
+private:
+  explicit observer_list_creator(observer_vector &observers)
+  : observers_(observers) {
+    if constexpr (sizeof...(ObserverType) != 0) {
+      build_observer<ObserverType...>();
+    }
+  }
+
+  template <template <typename> class FirstObserverType>
+  void build_observer() {
+    try_copy_on_missing<FirstObserverType>();
+  }
+
+  template <template <typename> class FirstObserverType, template <typename> class NextObserverType, template <typename> class... RestObserverType>
+  void build_observer() {
+    try_copy_on_missing<FirstObserverType>();
+    build_observer<NextObserverType, RestObserverType...>();
+  }
+
+  template <template <typename> class CurrentObserverType>
+  void try_copy_on_missing() {
+    bool is_missing{true};
+    for ( const auto &obs : observers_ ) {;
+      if (dynamic_cast<const CurrentObserverType<Type>*>(obs.get())) {
+        is_missing = false;
+        break;
+      }
+    }
+
+    if (is_missing) {
+      append<CurrentObserverType<Type>>();
+    }
+  }
+
+  template <class CurrentObserverType>
+  void append(std::enable_if_t<std::is_default_constructible_v<CurrentObserverType> || std::is_trivially_default_constructible_v<CurrentObserverType>>* = nullptr) {
+    observers_.emplace_back(std::make_unique<CurrentObserverType>());
+  }
+
+  template <class CurrentObserverType>
+  void append(std::enable_if_t<!std::is_default_constructible_v<CurrentObserverType> && !std::is_trivially_default_constructible_v<CurrentObserverType>>* = nullptr) {
+    static_assert("no default constructor");
+  }
+
+private:
+  observer_vector &observers_;
+};
+
+}
+#endif //MATADOR_OBSERVER_LIST_CREATOR_HPP

include/matador/object/internal/shadow_repository.hpp

@@ -40,6 +40,11 @@ public:
   [[nodiscard]] std::shared_ptr<object> object_for_type(const std::type_index &ti) const;
   void remove_object_for_type(const std::type_index &ti) const;
 
+  [[nodiscard]] bool is_node_announced(const std::type_index &ti) const;
+  void push_announce_node(const std::type_index &ti, const node_ptr &node) const;
+  [[nodiscard]] node_ptr announce_node(const std::type_index &ti) const;
+  [[nodiscard]] node_ptr pop_announce_node(const std::type_index &ti) const;
+
 private:
   repository& repo_;
 };