By Matthew Telles

Such a lot books conceal the syntax of the language. This booklet covers a few attention-grabbing the way to use it successfully. particularly, i used to be attracted to this booklet for its instance of a category manufacturing facility. now not a subject coated in such a lot books.

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We want the entire thing to be completely automatic, so we invoke the proper form of the constructor before our ConfigurationFile constructor even starts. That generates a little programming peace of mind: As soon as you enter the code for the inherited class, you can be assured that all setup work has been done — which (in this case) also means the file is open and ready to be written to. ᠬ virtual ~ConfigurationFile() { DoSave(); } bool DoSave() ) ) ᠬ 4 std::string name; std::string value; for (int i=0; i

The interesting thing here is that the destructor for the base class is always called. Because the destructor is declared as virtual, the destructor chains upward through the destructors for the other classes that are derived from the base class. If we created destructors for each derived class, and printed out the results, then if you created a new PurpleGrape GreenGrape class, for example, that was derived from Grape, you would see output that looked like this: PurpleGrape destructing Grape destructing Deleting a fruit This output would be shown from the line in which we deleted the PurpleGrapeGreenGrape object.

This class will allow you to store configuration information for your application in an external file and access it in a consistent manner throughout your program source code. I’m just going to explore the idea of creating a single functional class out of “mix-in” classes that do one thing very well and then move on. ”) When you think about it, configuration files have two basic sets of functionality — a set of properties (representing name and value pairs) and a file manager (which reads and writes those pairs to and from disk).

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