empty copy-ctor #obscure

(Looks like one of those obscure interview questions to test candidate’s understanding.)

http://forums.codeguru.com/showthread.php?472842-RESOLVED-empty-copy-constructor shows that

  • empty copy-ctor ignores the role-model object.
  • If there’re any fields in the class, they get default-initialized.
  • If a field is a pointer it will be uninialized
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