Write an expression to dynamically cast a pointer to a Query_base to a pointer to an AndQu...

Write an expression to dynamically cast a pointer to a Query_base to a pointer to an AndQuery (§ 15.9.1, p. 636). Test the cast by using objects of AndQuery and of another query type. Print a statement indicating whether the cast works and be sure that the output matches your expectations.

§ 15.9.1, p. 636

Exercise 31

Given that s1, s2, s3, and s4 are all strings, determine what objects are created in the following expressions:

(a) Query(s1) | Query(s2) & ~ Query(s3);

(b) Query(s1) | (Query(s2) & ~ Query(s3));

(c) (Query(s1) & (Query(s2)) | (Query(s3) & Query(s4)));