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Дата изменения: Sun Jul 8 23:42:43 2007
Дата индексирования: Sat Dec 22 07:18:17 2007
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XMM-Newton Science Analysis System


dal (dal-1.182.1) [xmmsas_20070708_1801-7.1.0]

Meta Index / Home Page / F90 DAL API

Handles

Handles hide the internal details of the underlying C++ classes. Essentailly a handle is a pointer to an object, but this detail will be irrelevant to most users.

Corresponding to each of the classes in the Abstract C++ API, there is a derived type.

The derived types ArrayT, AttributableT, AttributeT, BLockT; ColumnT, DataSetT, LabelledT and TableT are used to declare handles of objects.

By having different derived types for each C++ class, the API becomes more robust and type-safe.