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We make a Grad from an istream in much the same way that we make a Core from an istream namely, by calling the read member Before doing so, though, we first (implicitly) invoke the base-class default constructor to initialize the base part of the object Then, because this constructor is a member of class Grad, the read that is called is Grad::read We don't bother to initialize thesis because the read function reads a value into thesis from is It is important to understand how derived-class objects are constructed Executing
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Grad g;
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causes the system to allocate enough space to hold Grad's five data elements, run the Core default constructor to initialize the data members in the Core part of g, and then run the default constructor for Grad Similarly, if we execute
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Grad g(cin);
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then after allocating an appropriate amount of space, the implementation will run the Core default constructor, followed by the Grad::Grad(istream&) constructor to read values into the name, midterm, final, thesis, and homework members
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132 Polymorphism and virtual functions
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We have not yet completely reimplemented the original Student_info abstraction That abstraction relied on a nonmember function to support part of its interface: It used the compare function to compare two student records This function is used by sort to arrange records in alphabetical order Our new comparison function is identical to the one we wrote in 931/162 except for the change in type name:
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bool compare(const Core& c1, const Core& c2) { return c1name() < c2name(); }
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We compare two student records by comparing their names We delegate the real work to the string library < operator What is interesting about this code is that we can use it to compare both Core records and Grad records, or even to compare a Core record with a Grad record:
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Grad g(cin); Grad g2(cin); Core c(cin); Core c2(cin); compare(g, g2); compare(c, c2); compare(g, c); // read a Grad record // read a Grad record // read a Core record // read a Core record // compare two Grad records // compare two Core records // compare Grad record with a Core record
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In each of these calls to compare, the name member of class Core will be run to determine the value to return from compare Obviously, this is the right member to call for class Core, but what about for Grad When we defined class Grad, we said that it is inherited from Core, and we did not redefine the name function Thus, when we invoke gname() for a Grad object g, we are invoking the name member that it inherited from Core That function operates the same way on a Grad as it does on a Core: It fetches the underlying n field from the Core part of the object The reason that we can pass a Grad object to a function expecting a Core& is that we said that Grad is inherited from Core, so every Grad object has a Core part:
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Because every Grad object has a Core part, we can bind compare's reference parameters to the Core portions of Grad objects, exactly as we can bind them to plain Core objects Similarly, we could have defined compare to operate on pointers to Core or on objects of type Core (as opposed to a reference to Core) In either case, we could still call the function on behalf of a Grad object If the function took pointers, we could pass a pointer to Grad The compiler would convert the Grad* to a Core*, and would bind the pointer to the Core part of the Grad object If the function took a Core object, then what would be passed is just the Core portion of the object There can be striking
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