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Compaq C Language Reference Manual_2

Tham khảo tài liệu 'compaq c language reference manual_2', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 4 Types Values of the string type can be written as string literals 2.5.3.5 . The string keyword is simply an alias for the predefined System.String class. Writing the keyword string is exactly the same as writing System.String and vice versa. 4.2.4 Interface types 4.2.5 Array types An array is a data structure that contains a number of variables which are accessed through computed indices. The variables contained in an array also called the elements of the array are all of the same type and this type is called the element type of the array. Array types are described in 12. 4.2.6 Delegate types A delegate is a data structure that refers to a static method or to an object instance and an instance method of that object. The closest equivalent of a delegate in C or C is a function pointer but whereas a function pointer can only reference static functions a delegate can reference both static and instance methods. In the latter case the delegate stores not only a reference to the method s entry point but also a reference to the object instance for which to invoke the method. Delegate types are described in 15. 4.3 Boxing and unboxing Boxing and unboxing is a central concept in C s type system. It provides a binding link between value-types and reference-types by permitting any value of a value-type to be converted to and from type object. Boxing and unboxing enables a unified view of the type system wherein a value of any type can ultimately be treated as an object. 4.3.1 Boxing conversions A boxing conversion permits any value-type to be implicitly converted to the type object or to any interfacetype implemented by the value-type. Boxing a value of a value-type consists of allocating an object instance and copying the value-type value into that instance. The actual process of boxing a value of a value-type is best explained by imagining the existence of a boxing class for that type. For any value-type T the boxing class would be declared as follows class T_Box