From d022256a4136234d742e3178d31948b5f88bc0f6 Mon Sep 17 00:00:00 2001
From: randomdan <randomdan@localhost>
Date: Sun, 15 Sep 2013 12:43:27 +0000
Subject: Allow instance registration to occur with different key types

---
 project2/common/instanceStore.h | 103 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 project2/common/instanceStore.h

(limited to 'project2/common/instanceStore.h')

diff --git a/project2/common/instanceStore.h b/project2/common/instanceStore.h
new file mode 100644
index 0000000..c61ccfe
--- /dev/null
+++ b/project2/common/instanceStore.h
@@ -0,0 +1,103 @@
+#ifndef INSTANCESTORE_H
+#define INSTANCESTORE_H
+
+#include <boost/foreach.hpp>
+#include <boost/function.hpp>
+#include <set>
+#include <map>
+#include <safeMapFind.h>
+
+/// A static collection of any type, specifically with automatically cleaned up storage of a function static variable
+// which makes it safe to use in constructor functions.
+template <class Type, class StoreType>
+class InstanceStore {
+	public:
+		static const StoreType & GetAll()
+		{
+			return *getInstances();
+		}
+
+		static void Add(const typename StoreType::value_type & p)
+		{
+			getInstances()->insert(p);
+		}
+
+		template <typename EraseByType>
+		static void Remove(const EraseByType & p)
+		{
+			getInstances()->erase(p);
+			prune();
+		}
+
+		static void OnEach(const boost::function<void(typename StoreType::value_type &)> & func)
+		{
+			BOOST_FOREACH(const auto & l, GetAll()) {
+				try {
+					func(l.get());
+				}
+				catch (...) {
+				}
+			}
+			prune();
+		}
+
+		static void OnAll(const boost::function<void(Type *)> & func)
+		{
+			BOOST_FOREACH(const auto & l, GetAll()) {
+				try {
+					func(l.get());
+				}
+				catch (...) {
+				}
+			}
+			prune();
+		}
+
+	private:
+		static void prune()
+		{
+			auto & ps = getInstances();
+			if (ps->empty()) {
+				delete ps;
+				ps = NULL;
+			}
+		}
+
+		static StoreType * & getInstances()
+		{
+			static StoreType * instances = NULL;
+			if (!instances) {
+				instances = new StoreType();
+			}
+			return instances;
+		}
+};
+
+/// Keyed collection of instances
+template <class Type, class KeyType>
+class InstanceMap : public InstanceStore<Type, std::map<KeyType, boost::shared_ptr<Type>>> {
+	public:
+		typedef std::map<KeyType, boost::shared_ptr<Type>> Store;
+		typedef typename Store::value_type Value;
+
+		static void Add(const KeyType & k, Type * p) {
+			InstanceStore<Type, Store>::Add(Value(k, boost::shared_ptr<Type>(p)));
+		}
+		
+		static void Add(const KeyType & k, const boost::shared_ptr<Type> & p) {
+			InstanceStore<Type, Store>::Add(Value(k, p));
+		}
+
+		template <class E> static boost::shared_ptr<Type> Get(const KeyType & n) 
+		{
+			return safeMapLookup<E>(InstanceStore<Type, Store>::GetAll(), n);
+		}
+};
+
+/// Anonymous collection of instances
+template <class Type>
+class InstanceSet : public InstanceStore<Type, std::set<boost::shared_ptr<Type>>> {
+};
+
+#endif
+
-- 
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