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lhict (至少还有我) 于 (Sat Apr 28 16:39:31 2007) 提到:
You have a class that many libraries depend on. Now you need to modify
the class for one application. Which of the following changes require
recompiling all libraries before it is safe to build the application?
a. add a constructor
b. add a data member
c. change destructor into virtual
d. add an argument with default value to an existing member function
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