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Testing and Debugging Hints |
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1. Review the Testing and Debugging Hints for Chapter 15. They apply to the design and testing of C++ classes, which are at the heart of OOP. |
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2. When using inheritance, don't forget to include the word public when declaring the derived class: |
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class DerivedClass : public BaseClass
{
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}; |
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The word public makes BaseClass a public base class of DerivedClass. That is, clients of DerivedClass can apply any public BaseClass operation (except constructors) to a DerivedClass object. |
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3. The header file containing the declaration of a derived class must #include the header file containing the declaration of the base class. |
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4. Although a derived class inherits the private and public members of its base class, it cannot directly access the inherited private members. |
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5. If a base class has a constructor, it is invoked before the derived class's constructor is executed. If the base class constructor requires parameters, you must pass these parameters using a constructor initializer: |
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DerivedClass::DerivedClass( )
: BaseClass(param1, param2)
{
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} |
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If you do not include a constructor initializer, the base class's default constructor is invoked. |
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6. If a class has a member that is an object of another class and this member object's constructor requires parameters, you must pass these parameters using a constructor initializer: |
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SomeClass::SomeClass( )
: memberObject(param1, param2)
{
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} |
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