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135 Using the handle class
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Having finished the handle class, we can now use it to allow our initial program from 96/166 to work with but one change:
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int main() { vector<Student_info> students; Student_info record; string::size_type maxlen = 0; // read and store the data while (recordread(cin)) { maxlen = max(maxlen, recordname()size()); studentspush_back(record); } // alphabetize the student records sort(studentsbegin(), studentsend(), Student_info::compare); // write the names and grades for (vector<Student_info>::size_type i = 0; i != studentssize(); ++i) { cout << students[i]name() << string(maxlen + 1 - students[i]namesize(), ' '); try { double final_grade = students[i]grade(); streamsize prec = coutprecision(); cout << setprecision(3) << final_grade << setprecision(prec) << endl; } catch (domain_error e) { cout << ewhat() << endl; } } return 0; }
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The input loop now reads and processes two kinds of records One kind of record represents a student who is completing only the core requirements for the course; the other kind represents a student who wants graduate credit The loop works because the read function for Student_info reads either kind of record That function first reads the character that says what kind of record we're about to read, and then allocates an object of the appropriate type, initializing the object from the input stream It constructs the underlying Core or Grad object by reading the data, and stores a pointer to the newly created object in record We copy the Student_info object into the vector, which copies the object as a side effect of running the Student_info copy constructor The next step is to sort the data, which we do by invoking sort, passing it the Student_info::compare function That function calls the base-class name function to compare the names in the objects The output loop remains unchanged On each trip through the loop, students[i] denotes a Student_info object That object contains a pointer to an object that is either a Core or a Grad When we call the grade function for Student_info, that function will use the pointer to call the (virtual) grade function on the underlying object The type of object to which the handle points will determine which version to call at runtime Finally, the objects that were allocated inside the read for the Student_info function will be automatically freed when we exit main On exiting main, the vector will be destroyed The destructor for vector will destroy each element in students, which will cause the destructor for Student_info to be run When that destructor runs, it will delete each of
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the objects allocated in read
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136 Subtleties
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Although the ideas behind inheritance and dynamic binding are powerful, they can appear mysterious, at least at first Now that we've seen examples that use these ideas, let's look at some of the associated subtleties that often cause trouble
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1361 Inheritance and containers
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In section 1331/239, we noted that when we say that we want to store Core objects in a container, we're saying that the container will hold Core objects and nothing but Core objects This assertion might have been surprising: It might seem that we should be able to store Core objects or objects derived from Core in the container However, if we think about our own implementation of Vec from 11, we know that at some point, the Vec has to allocate storage for the objects that it contains When we allocate that storage, we say which exact type to allocate There is no virtual-like mechanism that determines what kind of object is needed and allocates enough space to hold that object What may be more surprising is what would happen if we persisted in defining a vector<Core> into which we intended to place either Core objects or Grad objects The answer is that we could do so, but the results would probably be a surprise; for example
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vector<Core> students; Grad g(cin); studentspush_back(g); // read a Grad // store the Core part(!) of g in students
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We are allowed to store the Grad object in students, because we can use a Grad object wherever a reference to a Core object is required The push_back function takes a reference to the vector's element type, so we can pass g to push_back However, when we put the object into students, only the Core portion of g is copied! As in 1322/235, this behavior is actually what we asked for, although it can be surprising especially when encountered for the first time What will happen is that push_back will expect that it was given a Core object, and will construct a Core element, copying only the Core parts of the object, ignoring whatever is specific to the Grad class
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