TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 144

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 144', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | other attributes of the quantum file. But what is the type of m_MOA and how does it give us access to the quantum file attributes To answer these questions we re going to have to get into some fairly complex implementation and language issues. We ll start this excursion with a look at the interface for the MainObj ectArrayPtr class shown in Figure . The interface for the MainObjectArrayPtr class from quantum Figure newquant. 03 codelist You will notice that this class has an embedded class called MainObj ectArray defined within it and that the embedded class has quite a few member functions. You may also notice that the MainObj ectArrayPtr class itself has only a few member functions most of which are the standard structural member functions -- the normal and default constructors the destructor and the assignment operator. One of the constructors is the conversion function that constructs a MainObj ectArrayPtr object from a QuantumFile pointer used in the FlexArray Open function and the others are the default constructor and copy constructor. However there is one member function that is anything but standard operator- . Why would we want to redefine that operator and what can a custom version of operator- do All Hope Abandon Ye Who Enter Here Before we get through with this question we will have entered a realm of C where relatively few have trespassed. I don t believe in adding complexity for the sake of complexity so why would I use a feature of C that most C programmers have never dealt with Because we need this feature to improve the ease of use and reliability of programs using this quantum file access method implementation. A little history lesson is appropriate here so you can see that I m not speaking from a solely theoretical perspective. The first edition of this book included an implementation of the quantum file access method written in It had many of the features that the current implementation has but it was much

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