A.18.17 The Generic Package Containers.Indefinite_Multiway_Trees
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AI05-0136-1}
The language-defined generic package Containers.Indefinite_Multiway_Trees
provides a multiway tree with the same operations as the package Containers.Multiway_Trees
(see A.18.10), with the difference that
the generic formal Element_Type is indefinite. Static Semantics
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AI05-0136-1}
The declaration of the generic library package
Containers.Indefinite_Multiway_Trees has the same
contents and semantics as Containers.Multiway_Trees except:3/3
The generic formal Element_Type
is indefinite.
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The
procedure with the profile:
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procedure Insert_Child (Container : in out Tree;
Parent : in Cursor;
Before : in Cursor;
Position : out Cursor;
Count : in Count_Type := 1);
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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 2005
7.a/3
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AI05-0136-1}
The generic package Containers.Indefinite_Multiway_Trees
is new.
Ada 2005 and 2012 Editions sponsored in part by Ada-Europe
