test23.cpp: In constructor 'Object1::Object1(Data1*)':
test23.cpp:46:24: warning: Using field 'this->dataptr' without checking for null pointer
         dataptr->ftest1();
                        ^
test23.cpp: In constructor 'Object1::Object1(Data1*)':
test23.cpp:46:24: warning: Using field 'this->dataptr' without checking for null pointer
test23.cpp: In member function 'void Object1::func3(Data1*)':
test23.cpp:72:25: warning: Using parameter 'ptr1' without checking for null pointer
             ptr1->ftest1();
                         ^
test23.cpp: In member function 'void Object1::func5(Data1*)':
test23.cpp:90:25: warning: Using parameter 'ptr1' without checking for null pointer
             ptr1->ftest1();
                         ^