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13.12 Pragma Restrictions

A pragma Restrictions expresses the user's intent to abide by certain restrictions. This may facilitate the construction of simpler run-time environments.

Syntax

The form of a pragma Restrictions is as follows:

   
         pragma Restrictions(restriction{, restriction});

       restriction ::= restriction_identifier
           | restriction_parameter_identifier => expression

Name Resolution Rules

Unless otherwise specified for a particular restriction, the expression is expected to be of any integer type.

Legality Rules

Unless otherwise specified for a particular restriction, the expression shall be static, and its value shall be nonnegative.

Static Semantics

The set of restrictions is implementation defined.

Post-Compilation Rules

A pragma Restrictions is a configuration pragma; unless otherwise specified for a particular restriction, a partition shall obey the restriction if a pragma Restrictions applies to any compilation unit included in the partition.

Implementation Permissions

An implementation may place limitations on the values of the expression that are supported, and limitations on the supported combinations of restrictions. The consequences of violating such limitations are implementation defined.

NOTES

(28) Restrictions intended to facilitate the construction of efficient tasking run-time systems are defined in D.7. Safety- and security-related restrictions are defined in H.4.

(29) An implementation has to enforce the restrictions in cases where enforcement is required, even if it chooses not to take advantage of the restrictions in terms of efficiency.

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