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C# is a language in which the null object pattern can be properly implemented. This example shows animal objects that display sounds and a NullAnimal instance used in place of the C# null keyword. The null object provides consistent behaviour and prevents a runtime null reference exception that would occur if the C# null keyword were used instead.
null; object; operator; ... String str = stream as String; // Will return null. ... and makes use of a certain pattern described in C#'s language specification in ...
Restricting the format of the input is a possible maintenance (bug fixing) solution. [clarification needed] Essentially, this means validating input information to check that it is in the correct format, in order to reduce the possibility of the magic string being discovered by the user. Examples include validating a telephone number to ensure ...
Nullable types are a feature of some programming languages which allow a value to be set to the special value NULL instead of the usual possible values of the data type.In statically typed languages, a nullable type is an option type, [citation needed] while in dynamically typed languages (where values have types, but variables do not), equivalent behavior is provided by having a single null ...
In object-oriented languages, string functions are often implemented as properties and methods of string objects. In functional and list-based languages a string is represented as a list (of character codes), therefore all list-manipulation procedures could be considered string functions.
Null character for indicating the end of a null-terminated string. Null pointer for indicating the end of a linked list or a tree . A set most significant bit in a stream of equally spaced data values, for example, a set 8th bit in a stream of 7-bit ASCII characters stored in 8-bit bytes indicating a special property (like inverse video ...
Because System.String does not conform to STRING_8, then the assignment above is valid only if System.String converts to STRING_8. The Eiffel class STRING_8 has a conversion procedure make_from_cil for objects of type System.String. Conversion procedures are also always designated as creation procedures (similar to constructors).
The examples are still bad, though. The C example misses the concept entirely (the pattern requires the concept of objects, so I don't know that this pattern can be implemented in C) and while an empty C# array may exhibit similar behavior to a null object, it certainly isn't a good example of the practical use of the pattern.