A Programming Language by Kenneth E. Iverson

By Kenneth E. Iverson

Iverson K.E. A Programming Language. (Wiley, 1962)(ISBN 0471430145)

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The type of this variable is String*[], which is not the same as String** (which is the type you would use to return a String reference as an in/out parameter). String[], which is the IL format that the runtime uses. This code also shows that the base class of the variable is System::Array. Thus, an array can be accessed through a typed array variable (String[]), a pointer to Array, or to Object, so all three of these declarations are allowed: String*Â a1[]Â =Â names; Array*Â a2Â =Â names; Object*Â a3Â =Â names; Of course, when you have an Array* pointer, you do not get the advantage of using the square bracket syntax, but it is possible to cast between the types.

Events are a formalization of this notification mechanism. They are declared in C++ with the __event keyword. public __gc class Worker { public:    __event CallMethod* m;    void DoSomething()    {       // Do some work here. event metadata. The methods have the name of the event prefixed with add_, remove_, and raise_. These methods are used to combine a delegate with the delegate field, to remove a delegate from that field, and to invoke the delegate. fire instance int32 Worker::raise_m(string) } In general, you should make the event public, in which case the compiler will make the delegate field private so that access to the field will be only through the methods added by the compiler.

Cpp __gc __interface IPrint {    void Print();    __property unsigned get_Pages();    __property void set_Pages(unsigned);    __event OnPrinted* printed; }; This interface has a property named Pages, a method named Print, and an event named OnPrinted. The intention is that the interface will be implemented by a class that can print documents, and when the print job has completed, it informs interested parties by raising the OnPrinted event. __delegate void OnPrinted(String*); __gc class PrintedDoc : public IPrint {    unsigned pages;    String* doc; public:    PrintedDoc(String* s, unsigned p) : doc(s), pages(p){}    void Print()    {       for (int i = 1; i <= pages; i++)          Console::WriteLine(S"printing page {0}", __box(i));       printed(doc);    }    __property unsigned get_Pages() { return pages; }    __property void set_Pages(unsigned num) { pages = num; }    __event virtual OnPrinted* printed; }; Because the event is a member of the interface, it is declared as virtual.

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