Here is the first line of the copy constructor for PFArrayD. The identifier PFArrayD is the name of the class, but in the header it is used three times with different meaning each time. Give the meaning for each use:
PFArrayD::PFArrayD( const PFArrayD& pfaObject)
PFArrayD::, the first one, says the identifier on the right of the scope resolution operator is being defined in the scope of class named by the identifier on the left.
::PFArrayD, the second one, is the name of the constructor
const PFArrayD&, the third one, is the name of the type argument that is expected.
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