Download ECMA-372 Standard - C++-CLI Language Specification, First PDF

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Additional info for ECMA-372 Standard - C++-CLI Language Specification, First Edition

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Explicit and named overriding can be combined, as follows: 27 C++/CLI Language Specification ref struct B { virtual void F() {} virtual void G() {} }; ref struct D : B { virtual void F() override = B::G {} }; A function can only be overridden once in any given class. Therefore, if an implicit or explicit override does the same thing as a named override, the program is ill-formed. ref struct B { virtual void F() {} virtual void G() {} }; ref struct virtual virtual virtual }; D : B { void F() override = B::F {} // Error: B::F is overridden twice void G() override {} // B::G is overridden void H() = B::G {} // Error: B::G is overridden twice [Note: If a base class is dependent on a template type parameter, a named override of a virtual function from that base class does not happen until the point of instantiation.

The example [AttributeUsage(AttributeTargets::All)] public ref class HelpAttribute : Attribute { String^ url; public: HelpAttribute(String^ url) { this->url = url; } String^ Topic; property String^ Url { String^ get() { return url; } } }; defines an attribute class named HelpAttribute that has one positional parameter (String^ url) and one named parameter (String^ Topic). Positional parameters are defined by the formal parameters for public instance constructors of the attribute class, and named parameters are defined by public non-static read-write fields and properties of the attribute class.

A generic definition must be a ref class, value class, interface class, delegate, or function. 1 Creating and consuming generics Below, we create a Stack generic class definition where we specify a type parameter, ItemType, using the same notation as with templates, except that the keyword generic is used instead of template. This type parameter acts as a placeholder until an actual type is specified at use. generic public ref class Stack { array^ items; public: Stack(int size) { items = gcnew array(size); } void Push(ItemType data) { … } ItemType Pop() { … } }; When we use the generic class definition Stack, we specify the actual type to be used by the generic class.

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