Modify to override assignment operator

This operator assigns new values to the xml_node, replacing its current
content.

Signed-off-by: Jihun Ahn <jhun.ahnn@gmail.com>

src/pugixml.cpp

@@ -5501,6 +5501,14 @@ namespace pugi
 		return append_child(name_);
 	}
 
+	PUGI__FN xml_node& xml_node::operator=(const char_t* rhs)
+	{
+		xml_node node = append_child(node_pcdata);
+
+		node.set_value(rhs);
+		return *this;
+	}
+
 	PUGI__FN bool xml_node::empty() const
 	{
 		return !_root;

src/pugixml.hpp

@@ -489,6 +489,7 @@ namespace pugi
 		bool operator>=(const xml_node& r) const;
 
 		xml_node operator[](const char_t* name_);
+		xml_node& operator=(const char_t* rhs);
 
 		// Check if node is empty.
 		bool empty() const;