Ada 95 Reference Manual
13.11.3 Pragma Controlled
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
The form of a pragma Controlled is as follows:
pragma Controlled(first_subtype_local_name);
Legality Rules
The first_subtype_local_name of a pragma Controlled shall denote a non-derived access subtype.
Static Semantics
A pragma Controlled is a representation pragma that specifies the controlled aspect of representation.
Garbage collection is a process that automatically reclaims storage, or moves objects to a different address, while the objects still exist.
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
An implementation need not support garbage collection, in which case, a pragma Controlled has no effect.
