19.4 Case Study: Matrices

• Define 2 new classes:
  • MatrixMismatchException, inherits from the standard class invalid_argument
  • MatrixIndexExceptions, inherits from out_of_range
    • C'tor also takes the offending index value
    • Uses a private method to append index to string before calling the base-class c'tor
• The test program has an example of using a single catch clause to catch both of these exceptions

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