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13.11.3 Pragma Controlled

(1)

Pragma Controlled is used to prevent any automatic reclamation of storage (garbage collection) for the objects created by allocators of a given access type.

Syntax

(2)

• The form of a pragma Controlled is as follows:

(3)
         pragma Controlled(first_subtype_local_name);

Legality Rules

(4)

The first_subtype_local_name of a pragma Controlled shall denote a non-derived access subtype.

Static Semantics

(5)

A pragma Controlled is a representation pragma that specifies the controlled aspect of representation.

(6)

Garbage collection is a process that automatically reclaims storage, or moves objects to a different address, while the objects still exist.

(7)

If a pragma Controlled is specified for an access type with a standard storage pool, then garbage collection is not performed for objects in that pool.

Implementation Permissions

(8)

An implementation need not support garbage collection, in which case, a pragma Controlled has no effect.

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