From a9a5308cf03fcd25492317b844a59019eacfac13 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Sat, 8 Apr 2023 18:35:46 +0200
Subject: Empty record item type

---
 src/storage.cpp | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

(limited to 'src/storage.cpp')

diff --git a/src/storage.cpp b/src/storage.cpp
index 2e948b0..b5688bb 100644
--- a/src/storage.cpp
+++ b/src/storage.cpp
@@ -1078,6 +1078,14 @@ RecordT<S>::Item::operator bool() const
 	return !holds_alternative<monostate>(value);
 }
 
+template<class S>
+optional<typename RecordT<S>::Item::Empty> RecordT<S>::Item::asEmpty() const
+{
+	if (holds_alternative<RecordT<S>::Item::Empty>(value))
+		return std::get<RecordT<S>::Item::Empty>(value);
+	return nullopt;
+}
+
 template<class S>
 optional<int> RecordT<S>::Item::asInteger() const
 {
@@ -1179,7 +1187,11 @@ optional<RecordT<S>> RecordT<S>::decode(const S & st,
 			begin = newline + 1;
 		}
 
-		if (type == "i")
+		if (type == "e") {
+			if (value.size() != 0)
+				return nullopt;
+			items->emplace_back(name, typename Item::Empty {});
+		} else if (type == "i")
 			try {
 				items->emplace_back(name, std::stoi(value));
 			} catch (invalid_argument &) {
@@ -1271,7 +1283,10 @@ vector<uint8_t> RecordT<S>::encodeInner() const
 		string type;
 		string value;
 
-		if (auto x = item.asInteger()) {
+		if (item.asEmpty()) {
+			type = "e";
+			value = "";
+		} else if (auto x = item.asInteger()) {
 			type = "i";
 			value = to_string(*x);
 		} else if (auto x = item.asText()) {
-- 
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