Initial commit

prototype_factory.hpp

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+//
+//  polymorphic_factory.hpp
+//  resource_factory
+//
+//  Created by Sam Jaffe on 8/14/16.
+//
+
+#pragma once
+
+#include <functional>
+#include <unordered_map>
+
+/*
+ * An instance prototype factory factory.
+ * The purpose of this object is a prefab for situations where you do not
+ * know, necessarily, at compile time all posible types inheriting from the
+ * base class. An example of this is in a game, you may have a Mob class.
+ * Mob may be instantiated as an Orc, Goblin, Slime, or Knight, but you don't
+ * know the exhaustive list, and the overhead for implementing an override
+ * for every single type is wasteful. With this object, you can initialize
+ * implementations from a string ID, and some parameters required.
+ * For example:
+ *
+ * class Monster { ... };
+ * class MonsterPrototype : public Monster {
+ *   public: Monster operator()(...) const { ... }
+ * };
+ * using MonsterGenerator = prototype_factory<Monster, ...>;
+ * MonsterGenerator::bind("Orc", MonsterPrototype("resources/orc.proto"));
+ *
+ * -----
+ *
+ * This can also be used as a generator for polymorphic types, optionally
+ * through a plugin system. This would allow a library consumer to define
+ * extensions to some polymorphic class, such as a Widget, and use built in
+ * features of the library to instantiate it. For example:
+ *
+ * class Widget { ... };
+ * class Button : public Widget { ... };
+ * using WidgetGenerator = prototype_factory<std::unique_ptr<Widget>, ...>;
+ * WidgetGenerator::bind("Button",
+ *                       [](...) { return std::make_unique<Button>(...); });
+ */
+template <typename Base, typename... Args>
+class prototype_factory {
+public:
+  using rval_t = Base;
+  using producer = std::function<rval_t(Args &&...)>;
+  
+  static rval_t get(std::string const & type_id, Args &&... args) {
+    auto it = _factories.find(type_id);
+    if (it == _factories.end()) { return rval_t(); }
+    else { return (it->second)(std::forward<Args>(args)...); }
+  }
+  
+  static bool bind(std::string const & type_id, producer p) {
+    return _factories.insert(std::make_pair(type_id, p)).second;
+  }
+private:
+  static std::unordered_map<std::string, producer> _factories;
+};

resource_factory.xcodeproj/project.pbxproj

@@ -0,0 +1,251 @@
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