By Dr. Markus Aleksy, Dr. Axel Korthaus, Professor Dr. Martin Schader (auth.)


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The elements of a sequence can be of a sequence type. 5. However, while the size of an array must be specified during its definition, this is optional for sequences. Thus, sequences offer more flexibility since they can store a large amount of data not known during the definition of the IDL interface and which is only determined at runtime. Conversely, marshaling and passing the values of arrays during a method invocation is often faster since the array’s size is known. 5 Arrays Arrays consist of a number of values of the same type.

OMG IDL supports two character types, char and wchar. The data type char occupies one byte (8 bit) and can encode arbitrary characters from a byte-oriented code set. Furthermore, the type wchar (wide char) can encode characters from any code set such as Unicode, for example. The size of wchar is implementation-dependent. The basic type boolean is used to denote logical (boolean) values. Its range consists of the two values FALSE and TRUE. In order to transmit 8-bit values that may not undergo any conversion during message communication, the basic type octet can be utilized.

Therefore, one should refrain from identifiers like class, for, if, PERFORM, etc. 1 Excursion: Style Guidelines for IDL Identifiers It is highly recommended certain conventions be followed when selecting IDL identifiers. Syntactically, these are not compulsory; but, they provide other readers of IDL interfaces with helpful information and simplify their orientation concerning the different types of elements in an IDL specification. In the OMG IDL Style Guide, the OMG recommends employing upper-case and lower-case letters as well as underscores according to the following rules: 1.

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