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Generic Units

1

A

is a program unit that is either a generic subprogram or a generic package.

A generic unit is a

, which can be parameterized, and from which corresponding (nongeneric) subprograms or packages can be obtained. The resulting program units are said to be

of the original generic unit.

2

A generic unit is declared by a

. This form of declaration has a

declaring any generic formal parameters. An instance of a generic unit is obtained as the result of a

with appropriate generic actual parameters for the generic formal parameters. An instance of a generic subprogram is a subprogram. An instance of a generic package is a package.

3

Generic units are templates. As templates they do not have the properties that are specific to their nongeneric counterparts. For example, a generic subprogram can be instantiated but it cannot be called. In contrast, an instance of a generic subprogram is a (nongeneric) subprogram; hence, this instance can be called but it cannot be used to produce further instances. 

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