From 3f2822035b3f1c67e0d6ce410bf43e84b0846037 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 20 Mar 2023 23:22:04 +0000
Subject: Add persistence support for std::optional<>s

---
 lib/persistence.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/persistence.h b/lib/persistence.h
index d38d4b1..cc2e4e5 100644
--- a/lib/persistence.h
+++ b/lib/persistence.h
@@ -6,6 +6,7 @@
 #include <iosfwd>
 #include <map>
 #include <memory>
+#include <optional>
 #include <span>
 #include <special_members.hpp>
 #include <sstream>
@@ -147,6 +148,10 @@ namespace Persistence {
 		}
 	};
 
+	template<typename T> struct SelectionT<std::optional<T>> : public SelectionT<T> {
+		explicit SelectionT(std::optional<T> & value) : SelectionT<T> {value.emplace()} { }
+	};
+
 	struct Persistable;
 	struct PersistenceStore {
 		using SelectionFactory = std::function<SelectionPtr()>;
-- 
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