CMSC 202 Computer Science II, Spring 2007, Section 010x

Lecture 22: TBD

Tuesday 04/24, 2007

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Assigned Reading:   

Slides As Shown:

• Announcements, etc: [slide view] [print view]

• Exceptions: [slide view] [print view]

• auto_ptr: [slide view] [print view]

Topics Covered:

• Continued with discussion of exceptions --- especially the difficulty of writing exception-safe code.

  Programs shown:

  • This version of the program derives the OutOfBounds class from std::runtime_error: twodim13.cpp, twodim13.h and vtest3.cpp.

  • It would be more convenient to derive from the out_of_range class that vector throws: twodim14.h, twodim14.cpp and vtest4.cpp.

  • We've been putting the definition of OutOfBounds in twodim.h and the implementation in twodim.cpp. This is convenient for classroom presentation, but causes problems because OutOfBounds is not templated: tdtest14a.cpp, tdtest14b.cpp and tdtest14.txt (compile errors).

  • Here's the fixed up version with OutOfBounds in its own .h and .cpp files: twodim15.h, twodim15.cpp, tdtest15a.cpp, tdtest15b.cpp, OutOfBounds.cpp, and OutOfBounds.h.

• Discussed the auto_ptr template class. They are useful for writing exception-safe code, especially with respect to memory leaks:

  Here are a couple of programs that we didn't try in class:

  • aptest1.cpp
  • Fred.h, aptest2.cpp.

• Went over list of topics for Midterm Exam II. (See announcement slides linked above.)