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Thinking in C++ Vol 2 - Practical Programming
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Solutions to selected exercises can be found in the electronic document The Thinking in C++ Volume 2 Annotated Solution Guide, available for a small fee from

1.      Create a Base class with a virtual destructor and a Derived class that inherits from Base. Create a vector of Base pointers that point to Base and Derived objects randomly. Using the contents your vector, fill a second vector with all the Derived pointers. Compare execution times between typeid( ) and dynamic_cast to see which is faster.

2.      Modify C16:AutoCounter.h in Volume 1 of this book so that it becomes a useful debugging tool. It will be used as a nested member of each class that you are interested in tracing. Turn AutoCounter into a template that takes the class name of the surrounding class as the template argument, and in all the error messages use RTTI to print the name of the class.

3.      Use RTTI to assist in program debugging by printing out the exact name of a template using typeid( ). Instantiate the template for various types and see what the results are.

4.      Modify the Instrument hierarchy from Chapter 14 of Volume 1 by first copying Wind5.cpp to a new location. Now add a virtual clearSpitValve( ) function to the Wind class, and redefine it for all the classes inherited from Wind. Instantiate a vector to hold Instrument pointers, and fill it with various types of Instrument objects created using the new operator. Now use RTTI to move through the container looking for objects in class Wind, or derived from Wind. Call the clearSpitValve( ) function for these objects. Notice that it would unpleasantly confuse the Instrument base class if it contained a clearSpitValve( ) function.

5.      Modify the previous exercise to place a prepareInstrument( ) function in the base class, which calls appropriate functions (such as clearSpitValve( ), when it fits). Note that prepareInstrument( ) is a sensible function to place in the base class, and it eliminates the need for RTTI in the previous exercise.

6.      Create a vector of pointers to 10 random Shape objects (at least Squares and Circles, for example). The draw( ) member function should be overridden in each concrete class to print the dimensions of the object being drawn (the length or the radius, whichever applies). Write a main( ) program that draws all the Squares in your container first, sorted by length, and then draws all Circles, sorted by radius.

7.      Create a large vector of pointers to random Shape objects. Write a non-virtual draw( ) function in Shape that uses RTTI to determine the dynamic type of each object and executes the appropriate code to draw the object with a switch statement. Then rewrite your Shape hierarchy the right way, using virtual functions. Compare the code sizes and execution times of the two approaches.

8.      Create a hierarchy of Pet classes, including Dog, Cat, and Horse. Also create a hierarchy of Food classes: Beef, Fish, and Oats. The Dog class has a member function, eat( ), that takes a Beef parameter, likewise, Cat::eat( ) takes a Fish object, and Oats objects are passed to Horse::eat( ). Create a vector of pointers to random Pet objects, and visit each Pet, passing the correct type of Food object to its eat( ) function.

9.      Create a global function named drawQuad( ) that takes a reference to a Shape object. It calls the draw( ) function of its Shape parameter if it has four sides (that is, if it s a Square or Rectangle). Otherwise, it prints the message Not a quadrilateral . Traverse a vector of pointers to random Shapes, calling drawQuad( ) for each one. Place Squares, Rectangles, Circles and Triangles in your vector.

10.    Sort a vector of random Shape objects by class name. Use type_info::before( ) as the comparison function for sorting.


Thinking in C++ Vol 2 - Practical Programming
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire