Check for invalid references in operators.
Check for invalid references in operators.

ksubramz/CppMicroServices,saschazelzer/CppMicroServices,mobileFX/CppMicroServices,quinnlin/CppMicroServices,CppMicroServices/CppMicroServices,CppMicroServices/CppMicroServices,ksubramz/CppMicroServices,quinnlin/CppMicroServices,CppMicroServices/CppMicroServices,Heather/CppMicroServices,ksubramz/CppMicroServices,ksubramz/CppMicroServices,Heather/CppMicroServices,saschazelzer/CppMicroServices,CppMicroServices/CppMicroServices,ksubramz/CppMicroServices,CppMicroServices/CppMicroServices,mobileFX/CppMicroServices