Ada 95 Quality and Style Guide Chapter 7

Chapter 7: Portability - TOC - 7.7 INPUT/OUTPUT

7.7.1 Name and Form Parameters

guideline

  • Use constants and variables as symbolic actuals for the Name and Form parameters on the predefined I/O packages. Declare and initialize them in an implementation dependency package.

    • rationale

    The format and allowable values of these parameters on the predefined I/O packages can vary greatly between implementations. Isolation of these values facilitates portability. Not specifying a Form string or using a null value does not guarantee portability because the implementation is free to specify defaults.

    notes

    It may be desirable to further abstract the I/O facilities by defining additional Create and Open procedures that hide the visibility of the Form parameter entirely (see Pappas 1985, 54-55).

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