Annotated Ada Reference Manual — Legal Information

A.18.12 The Package Containers.Indefinite_Hashed_Maps

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{AI95-00302-03} The language-defined generic package Containers.Indefinite_Hashed_Maps provides a map with the same operations as the package Containers.Hashed_Maps (see A.18.5), with the difference that the generic formal types Key_Type and Element_Type are indefinite.

Static Semantics

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{AI95-00302-03} The declaration of the generic library package Containers.Indefinite_Hashed_Maps has the same contents as Containers.Hashed_Maps except:

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The generic formal Key_Type is indefinite.

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The generic formal Element_Type is indefinite.

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The procedure with the profile:

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procedure Insert (Container : in out Map;
                  Key       : in     Key_Type;
                  Position  :    out Cursor;
                  Inserted  :    out Boolean);

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is omitted.

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Discussion: This procedure is omitted because there is no way to create a default-initialized object of an indefinite type. We considered having this routine insert an empty element similar to the empty elements of a vector, but rejected this possibility because the semantics are fairly complex and very different from the existing case. That would make it more error-prone to convert a container from a definite type to an indefinite type; by omitting the routine completely, any problems will be diagnosed by the compiler.

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The actual Element parameter of access subprogram Process of Update_Element may be constrained even if Element_Type is unconstrained.

Extensions to Ada 95

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