TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 145

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 145', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | another enclosing class called NewBlockPtr. If that Block class had a Get member function we could declare it as char NewBlockPtr Block Get int p_Index and the compiler would have no problem telling which Block Get we meant. Similarly an unadorned Block Get int p_Index would be yet another completely distinct One more safety feature in this new arrangement is worthy of note the constructor for Block is protected so that the user can t accidentally create one and use it instead of referencing it through a BlockPtr object the way we intend. This isn t very likely anyway since the user would have to specify BlockPtr Block as the type which isn t easy to do by accident however according to the principles of object-oriented programming it is best to hide the internals of our classes whenever possible so that class user code can t depend on those internals. That restriction makes it possible for us to improve the implementation of our classes without breaking user code. Polite Pointing Now that we ve investigated the notion of redefining operator- let s return to the MainObj ectArrayPtr class that we were discussing a little while ago. We ll start with Figure which shows the code for the normal constructor for that class. The normal constructor for MainObjectArrayPtr from quantum Figure newquant. 04 codelist This function is fairly simple. It creates a new MainObj ectArray object using the normal constructor for that class. This is the body object that will actually do the work of both of these classes. Then it sets the reference count of that object to 1 indicating that there is one MainObj ectArray handle object using that body object. The general idea of reference counting is fairly simple as most great ideas are after you understand them at least . It s inefficient to copy a lot of data whenever we set one variable to the same value as another on the other hand copying a pointer to the data is much easier. However we .

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• Java C Scrip SQL
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