Fix for compiling with gcc 11.2

ecb2cf5f · Maarten L. Hekkelman · 7f27da9b · ecb2cf5f
Commit ecb2cf5f authored Dec 08, 2021 by Maarten L. Hekkelman
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include/cif++/Cif++.hpp
+2 -2

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--- a/include/cif++/Cif++.hpp
+++ b/include/cif++/Cif++.hpp
@@ -1169,11 +1169,11 @@ struct Empty

 struct Key
 {
-	Key(const std::string &itemTag)
+	explicit Key(const std::string &itemTag)
 		: mItemTag(itemTag)
 	{
 	}
-	Key(const char *itemTag)
+	explicit Key(const char *itemTag)
 		: mItemTag(itemTag)
 	{
 	}