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Once again, the default memberwise initialization of music with folk is complete It is well behaved NameQuery has no need to provide an explicit copy constructor The NotQuery derived class contains a Query base class subobject and a Query* data member, _op, addressing its operand allocated on the free store The NotQuery destructor applies the delete expression to the operand The NotQuery class cannot safely allow default memberwise initialization of its _op member, and so must provide an explicit copy constructor Its implementation makes use of the virtual clone() function defined in the previous section
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inline NotQuery:: NotQuery( const NotQuery &rhs ) // invokes Query::Query( const Query &rhs ) : Query( rhs ) { _op = rhs_op->clone(); }
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The memberwise initialization of one NotQuery class object with another causes the following two steps to occur: 1 The compiler checks to see if the NotQuery class defines an explicit instance of the copy constructor It does 2 The NotQuery copy constructor is invoked to carry out the memberwise initialization That's it It is the responsibility of the NotQuery copy constructor to carry out the correct initialization of both its base class subobject and nonstatic data members The AndQuery and OrQuery instances are similar to NotQuery, and are left as an exercise for the reader Memberwise assignment is similar to memberwise initialization If an explicit copy assignment operator is present, it is invoked to assign one class object with another Otherwise, default memberwise assignment is applied If a base class is present, the base class subobject is memberwise assigned first If the base class provides an explicit copy assignment operator, it is invoked Otherwise, default memberwise assignment is applied recursively to the base classes and members of the base class subobject Each nonstatic data member is examined in turn in the order of declaration If it is a nonclass type, the right-hand instance is copied to the left If it is a class type and the class defines an explicit copy assignment operator, the operator is invoked Otherwise, default memberwise assignment is applied recursively to the base classes and members of the member class object Here is our Query copy assignment operator Once again, we don't need to copy the solution set at this point, but rather simply prevent its default copy:
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Query& Query:: operator=( const Query &rhs ) { // prevent self-assignment if ( &rhs != this ) { _paren = rhs_paren; _loc = rhs_loc; delete _solution; _solution = 0;
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} return *this; }
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NameQuery does not require an explicit copy assignment operator The assignment of one NameQuery object with another results in the following two steps: 1 The explicit Query copy assignment operator is invoked to assign the Query subobjects of the two NameQuery objects 2 The explicit string copy assignment operator is invoked to assign the string member class objects of the two NameQuery objects We cannot do better with an explicit copy assignment operator for NameQuery The default memberwise assignment behavior is sufficient NotQuery, OrQuery, and AndQuery each require an explicit copy assignment operator to copy their respective operands safely Here is the NotQuery instance:
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inline NotQuery& NotQuery:: operator=( const NotQuery &rhs ) { // prevent self-assignment if ( &rhs != this ) { // invoke Query copy assignment operator this->Query::operator=( rhs ); // copy the operand _op = rhs_op->clone(); } return *this; }
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Unlike the copy constructor, there is no special portion of the copy assignment operator through which to invoke the base class copy assignment operator There are two syntactic forms for invoking it: our explicit invocation illustrated earlier, and through an explicit cast as follows:
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(*static_cast<Query*>(this)) = rhs;
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The AndQuery and OrQuery copy assignment instances are similar and left as an exercise Here is a small test program to exercise our implementation as a sanity check that it actually works We simply create or copy an object, then print out its values
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