A.18.13 The Generic 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}
{
AI05-0092-1}
The declaration of the generic library package
Containers.Indefinite_Hashed_Maps has the same contents
and semantics as
Containers.Hashed_Maps except:3/2
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
8.a/2
{
AI95-00302-03}
The generic package Containers.Indefinite_Hashed_Maps
is new.
Ada 2005 and 2012 Editions sponsored in part by Ada-Europe
