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28 Cards in this Set
- Front
- Back
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What is operator overloading and why does C++ provide it?
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?
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What overloaded operators do you get for free?
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&
. = -> |
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What operators cannot be overloaded?
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.
.* ?: sizeof :: |
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Restrictions of operator overloading
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one operand must be of a user defined class
operands must not have default values arity cannot be changed |
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*This and role in overloading
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Every member function is passed a reference to the object as *this hidden. The reason why binary overloaded operators only have one parameter.
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Free function overloading requires what?
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access to private data members by public member functions
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Why declare temporary object of the class in the implemenation of some overloaded functions
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???? Why ????
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Member binary what is passed implicitly and what is passed explicitly
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LHS is passed implicitly, RHS is passed explicitly
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Returning a reference to a object that is about to go out of scope?
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Causes a "dangling pointer"
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Do you return a reference for unary and binary asignment?
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Yes!
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the minus operator is both binary and unary?
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True
binary has an operand! unary does not. |
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Friends have direct access to the private members of the classes they are declared friends of
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True
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What operands have to be member functions
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=
() [] -> |
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operator<< returns a reference to an ostream &
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True!
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Assignment operator takes a reference paramater and returns a reference
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True!
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return *this
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? why return a dereference to this?
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What must you implement if your class has pointers?
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Default Constructor
Copy Constructor Destructor Assignment Operator |
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where do you declare static again?
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static must be redeclared outside the class specification (file scope) so memory can be allocated
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overloading
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same scope different signature
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overriding
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different scope same signature
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private members in inheritance
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only available at same class level scope. have to use public member functions to access
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prot inheritance
public/prot-> prot private->priv |
true
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priv
pub/prot->priv |
in derived clas
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public
public->public prot->prot priv->priv |
true!
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if a derived class constructor fails to call it's immediate parent what happens?
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it calls it implicitly
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always invoke a parent constructor
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true
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destructors are not inherited
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true
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constructors called top down
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true
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