Annotated Ada Reference ManualLegal Information
Contents   Index   References   Search   Previous   Next 

 A.18.1 The Package Containers

1/2
{AI95-00302-03} The package Containers is the root of the containers subsystem. 

Static Semantics

2/2
{AI95-00302-03} The library package Containers has the following declaration: 
3/2
package Ada.Containers is
   pragma Pure(Containers);
4/2
   type Hash_Type is mod implementation-defined;
5/2
   type Count_Type is range 0 .. implementation-defined;
6/2
end Ada.Containers;
7/2
{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. 
7.a/2
Implementation defined: The value of Containers.Hash_Type'Modulus. The value of Containers.Count_Type'Last.

Implementation Advice

8/2
{AI95-00302-03} Hash_Type'Modulus should be at least 2**32. Count_Type'Last should be at least 2**31–1. 
8.a/2
Implementation Advice: Containers.Hash_Type'Modulus should be at least 2**32. Containers.Count_Type'Last should be at least 2**31–1.
8.b/2
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

8.c/2
{AI95-00302-03} {extensions to Ada 95} The package Containers is new. 

Contents   Index   References   Search   Previous   Next 
Ada-Europe Sponsored by Ada-Europe