Download C++/CLI in Action by Nishant Sivakumar PDF

By Nishant Sivakumar

C++/CLI in motion is a realistic consultant that can assist you breathe new existence into your legacy C++ courses. The e-book starts with a concise C++/CLI instructional. It then fast strikes to the main subject matters of local / controlled code interop and mixed-mode programming. you are going to learn how to make the most of GUI frameworks like home windows varieties and WPF whereas protecting your local C++ company good judgment. The ebook additionally covers equipment for getting access to C# or VB.NET parts and libraries. Written for readers with a operating wisdom of C++.

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In this section, we’ll look at the syntax for using handles. We’ll also cover the related topic of using tracking references. 1 Syntax for using handles A handle is a reference to a managed object on the CLI heap and is represented by the ^ punctuator (pronounced hat). NOTE When I say punctuator in this chapter, I’m talking from a compiler perspective. As far as the language syntax is concerned, you can replace the word punctuator with operator and retain the same meaning. info Handles: the CLI equivalent to pointers 25 Handles are to the CLI heap what native pointers are to the native C++ heap; and just as you use pointers with heap-allocated native objects, you use handles with managed objects allocated on the CLI heap.

Because CLI types don’t support multiple base classes, value types can’t have any other base class. In addition, value types are always sealed and can’t be used as base classes. In the following code snippet, only the Derived3 class compiles. The other two classes attempt to inherit from a ref class and a value class, neither of which is permitted: ref class RefBase {}; value class ValBase {}; interface class IBase {}; value class Derived1 : RefBase {}; //error C3830 value class Derived2 : ValBase {}; //error C3830 value class Derived3 : IBase {}; These restrictions are placed on value types because value types are intended to be simple types without the complexities of inheritance or referential identity, which can be implemented using basic copy-by-value semantics.

Look at the following example of an abstract sealed class: ref class SA abstract sealed { public: static void DoStuff(){} private: static int bNumber = 0; }; As mentioned earlier, abstract sealed classes can’t have instance methods; attempting to include them will throw compiler error C4693. This isn’t puzzling when you consider that an instance method on an abstract sealed class would be worthless, because you can never have an instance of such a class. An abstract sealed class can’t be explicitly derived from a base class, although it implicitly derives from System::Object.

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