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15.34.md

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Query q = Query("fiery") & Query("bird") | Query("wind");

(a) List the constructors executed in processing that expression.

WordQuery(const std::string &) * 2
        |  /* WordQuery("fiery")  WordQuery("bird") */
        v
Query(const std::string &s) * 2
        |
        v
Query(const Query &) or Query(Query &&) * 2  /* call synthesized version */
        |
        v
BinaryQuery(const Query &, const Query &, std::string)
        |
        v
AndQuery(const Query &, const Query &)
        |
        v
Query(std::shared_ptr<Query_base>)    WordQuery(const std::string &)
        |                                   |  /* WordQuery("wind") */
        |                                   v
        |                             Query(const std::string &s)
        |                                   |
        +-----------------------------------+
        |
        v
Query(const Query &) or Query(Query &&) * 2  /* call synthesized version */
        |
        v
BinaryQuery(const Query &, const Query &, std::string)
        |
        v
OrQuery(const Query &, const Query &)
        |
        v
Query(std::shared_ptr<Query_base>)

(b) List the calls to rep that are made from cout << q.

Query::rep  /* q.rep() */
  |
  v
BinaryQuery::rep  /* q->rep() */ /* inherited by OrQuery */
  |
  +--------------------------------+
  |                                |
  v                                v
Query::rep  /* lhs.rep() */      Query::rep  /* rhs.rep() */
  |                                |
  |                                v
  |                              WordQuery::rep  /* q->rep() */ /* wind */
  v
BinaryQuery::rep  /* q->rep() */ /* inherited by AndQuery */
  |
  +--------------------------------+
  |                                |
  v                                v
Query::rep  /* lhs.rep() */      Query::rep  /* rhs.rep() */
  |                                |
  v                                v
WordQuery::rep  /* q->rep() */   WordQuery::rep  /* q->rep() */
/* fiery */                      /* bird */

(c) List the calls to eval made from q.eval().

Query::eval  /* q.eval() */
  |
  v
OrQuery::eval  /* q->eval() */
  |
  +------------------------------------+
  |                                    |
  v                                    v
Query::eval  /* lhs.eval()           Query::eval  /* rhs.eval() */
  |                                    |
  v                                    v
AndQuery::eval  /* q->eval() */      WordQuery::eval()  /* q->eval() */
  |
  v
  +------------------------------------+
  |                                    |
  v                                    v
Query::eval  /* lhs.eval() */        Query::eval  /* rhs.eval() */
  |                                    |
  v                                    v
WordQuery::eval()  /* q->eval() */   WordQuery::eval()  /* q->eval() */