A.18.1 The Package Containers
The package Containers is the root of the containers
The library package Containers has the following
package Ada.Containers is
type Hash_Type is mod implementation-defined;
type Count_Type is range 0 .. implementation-defined;
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.
The value of Containers.Hash_Type'Modulus.
The value of Containers.Count_Type'Last.
Capacity_Error is raised when the capacity of a
container is exceeded.
Hash_Type'Modulus should be at least 2**32. Count_Type'Last
should be at least 2**31–1.
be at least 2**32. Containers.Count_Type'Last should be at least 2**31–1.
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
Incompatibilities With Ada 2005
Exception Capacity_Error is
newly added to Containers. If Containers is referenced in a use_clause,
and an entity with the name Capacity_Error is defined in a package that
is also referenced in a use_clause,
the entity Capacity_Error may no longer be use-visible, resulting in
errors. This should be rare and is easily fixed if it does occur.
Ada 2005 and 2012 Editions sponsored in part by Ada-Europe