Introduction to C++ Dynamic Binding and User Defined Type Conversions

CS202 4- ‹#›

Run Time Type Identification

student* ps = new student;

if (typeid(*ps) == typeid(account))

cout <<"*ps is an account object" <<endl;

if (typeid(*ps) == typeid(checking))

cout <<"*ps is a checking object" <<endl;

if (typeid(*ps) == typeid(student))

cout <<"*ps is a student object" <<endl;

if (typeid(*ps) == typeid(savings))

cout <<"*ps is a savings object" <<endl;

nThe typeid operator is used to check the type of an object against a known type whereas the dynamic_cast operator can be used to check the type of an object against an entire hierarchy.