From a6f3f335e931acd12b908ca0b4028a08c102627c Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Thu, 29 Apr 2021 19:38:05 +0100
Subject: Extend factory map to include make_shared

---
 lib/persistance.cpp | 17 +++++++++++++----
 lib/persistance.h   |  7 +++++--
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/lib/persistance.cpp b/lib/persistance.cpp
index 0dd7cba..204e8f0 100644
--- a/lib/persistance.cpp
+++ b/lib/persistance.cpp
@@ -2,19 +2,28 @@
 #include <map>
 
 namespace Persistanace {
-	using NamedTypeFactories = std::map<std::string_view, std::function<std::unique_ptr<Persistable>()>>;
+	using Factories
+			= std::pair<std::function<std::unique_ptr<Persistable>()>, std::function<std::shared_ptr<Persistable>()>>;
+	using NamedTypeFactories = std::map<std::string_view, Factories>;
 	static NamedTypeFactories namedTypeFactories;
 
 	void
-	Persistable::addFactory(const std::string_view t, std::function<std::unique_ptr<Persistable>()> f)
+	Persistable::addFactory(const std::string_view t, std::function<std::unique_ptr<Persistable>()> fu,
+			std::function<std::shared_ptr<Persistable>()> fs)
 	{
-		namedTypeFactories.emplace(t, std::move(f));
+		namedTypeFactories.emplace(t, std::make_pair(std::move(fu), std::move(fs)));
 	}
 
 	std::unique_ptr<Persistable>
 	Persistable::callFactory(const std::string_view t)
 	{
-		return namedTypeFactories.at(t)();
+		return namedTypeFactories.at(t).first();
+	}
+
+	std::shared_ptr<Persistable>
+	Persistable::callSharedFactory(const std::string_view t)
+	{
+		return namedTypeFactories.at(t).second();
 	}
 
 	void
diff --git a/lib/persistance.h b/lib/persistance.h
index f797157..6e23272 100644
--- a/lib/persistance.h
+++ b/lib/persistance.h
@@ -10,6 +10,7 @@
 #include <stdexcept>
 #include <string>
 #include <string_view>
+#include <type_traits>
 #include <utility>
 #include <vector>
 
@@ -155,15 +156,17 @@ namespace Persistanace {
 		}
 
 		template<typename T> static void addFactory() __attribute__((constructor));
-		static void addFactory(const std::string_view, std::function<std::unique_ptr<Persistable>()>);
+		static void addFactory(const std::string_view, std::function<std::unique_ptr<Persistable>()>,
+				std::function<std::shared_ptr<Persistable>()>);
 		static std::unique_ptr<Persistable> callFactory(const std::string_view);
+		static std::shared_ptr<Persistable> callSharedFactory(const std::string_view);
 	};
 
 	template<typename T>
 	void
 	Persistable::addFactory()
 	{
-		addFactory(typeName<T>(), std::make_unique<T>);
+		addFactory(typeName<T>(), std::make_unique<T>, std::make_shared<T>);
 	}
 
 	template<typename T>
-- 
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