From b68d2027fe7505c14899db9fa1496b5ace09e25f Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Thu, 20 Jan 2022 22:25:16 +0800
Subject: ...

---
 include/cru/xml/XmlNode.hpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'include/cru/xml')

diff --git a/include/cru/xml/XmlNode.hpp b/include/cru/xml/XmlNode.hpp
index 0972037a..71753410 100644
--- a/include/cru/xml/XmlNode.hpp
+++ b/include/cru/xml/XmlNode.hpp
@@ -5,6 +5,7 @@
 #include "cru/common/String.hpp"
 
 #include <algorithm>
+#include <optional>
 #include <unordered_map>
 #include <vector>
 
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