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Refer to Object_var Examples
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The _var classes are wrappers around pointers to a type
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state is private, usually a pointer and a release flag
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In many contexts they act like the raw pointer (#1)
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Assigning a pointer to a var (#2):
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Releases the pointer the var had
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Gives ownership of one reference to the var
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Assigning a var to a var (#3)
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Release the pointer of the LHS var
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Gives the LHS var a duplicate of the RHS var
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The destructor for var types (#4)
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releases a reference if the pointer is not NULL
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The _retn() method is used to return values (#5)
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The pointer is returned and forgotten
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The out() method (#6)
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releases the reference, returns a holder for an
out parameter
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