Annotated Ada Reference Manual — Legal Information

A.18.1 The Package Containers

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{AI95-00302-03} The package Containers is the root of the containers subsystem.

Static Semantics

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{AI95-00302-03} The library package Containers has the following declaration:

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package Ada.Containers is
pragma Pure(Containers);

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type Hash_Type is mod implementation-defined;

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type Count_Type is range 0 .. implementation-defined;

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end Ada.Containers;

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{AI95-00302-03} Hash_Type represents the range of the result of a hash function. Count_Type represents the (potential or actual) number of elements of a container.

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Implementation defined: The value of Containers.Hash_Type'Modulus. The value of Containers.Count_Type'Last.

Implementation Advice

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{AI95-00302-03} Hash_Type'Modulus should be at least 2**32. Count_Type'Last should be at least 2**31–1.

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Implementation Advice: Containers.Hash_Type'Modulus should be at least 2**32. Containers.Count_Type'Last should be at least 2**31–1.

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Discussion: This is not a requirement so that these types can be declared properly on machines with native sizes that are not 32 bits. For instance, a 24-bit target could use 2**24 for Hash_Type'Modulus.

Extensions to Ada 95

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{AI95-00302-03} {extensions to Ada 95} The package Containers is new.