operator<< for VarInt

include/sp/common/VarInt.h

@@ -7,6 +7,7 @@
 
 #include <cstddef>
 #include <cstdint>
+#include <ostream>
 
 namespace sp {
 
@@ -55,6 +56,11 @@ class VarInt {
 	 * \param var The variable integer to deserialize
 	 */
 	friend DataBuffer& operator>>(DataBuffer& in, VarInt& var);
+
+	/**
+	 * \brief overriding stream operator
+	 */
+	friend std::ostream& operator<<(std::ostream& a_Stream, const sp::VarInt& a_VarInt);
 };
 
 }  // namespace sp