From 627aa88ad2559f41d5be62d36cdbf536a97e4246 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 18 Jan 2021 02:08:01 +0000
Subject: Factor to support worlds, objects, windows etc

---
 utility/collection.hpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 utility/collection.hpp

(limited to 'utility/collection.hpp')

diff --git a/utility/collection.hpp b/utility/collection.hpp
new file mode 100644
index 0000000..1422a84
--- /dev/null
+++ b/utility/collection.hpp
@@ -0,0 +1,31 @@
+#ifndef COLLECTION_H
+#define COLLECTION_H
+
+#include <algorithm>
+#include <memory>
+
+template<typename Object> class Collection {
+public:
+	using Ptr = std::unique_ptr<Object>;
+	std::vector<Ptr> objects;
+
+	template<typename T = Object, typename... Params>
+	const auto &
+	create(Params &&... params)
+	{
+		return objects.emplace_back(std::make_unique<T>(std::forward<Params>(params)...));
+	}
+
+	template<typename T = Object, typename M = void, typename... Params>
+	void
+	apply(const M & m, Params &&... params) const
+	{
+		std::for_each(objects.cbegin(), objects.cend(), [&m, &params...](auto && op) {
+			if (auto o = dynamic_cast<T *>(op.get())) {
+				std::invoke(m, o, std::forward<Params>(params)...);
+			}
+		});
+	}
+};
+
+#endif
-- 
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