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!standard 09.01 (02) 98-03-27 AI95-00116/01
!class binding interpretation 98-03-27
!status ARG Approved (with changes) 13-0-0 95-11-01
!status work item 96-04-04
!status received 96-04-04
!priority Low
!difficulty Easy
!subject Elaboration of task type with no task_definition

!summary 96-04-04

For a task_type_declaration with no task_definition, an empty task_definition is assumed.

!question 96-04-04

A legal task_type_declaration is

task type TT;

By the grammar in paragraph 2, this task_type_declaration does not include a task_definition.

Paragraph 10 says that the elaboration of a task declaration elaborates the task_definition; what if there isn't one?

Paragraph 11 says the elaboration of a task_definition creates the task type and its first subtype; if there is no task_definition, when are the task type and its first subtype created?

The intent seems obvious. A good fix would be to state that

task type TT;

is equivalent to

task type TT is end TT;

providing an implicit task_definition.

!recommendation 98-03-27

(See summary.)

!wording 98-03-27

!discussion 98-03-27

The intent is clear, and is as stated in the summary, above.

!appendix


!section 9.1(02)
!subject Elaboration of task type with no task_definition
!reference RM95-9.1(2)
!reference RM95-9.1(10,11)
!from Keith Thompson 95-11-17
!reference 95-5392.a Keith Thompson 95-11-17>>

A legal task_type_declaration is

    task type TT;

By the grammar in paragraph 2, this task_type_declaration does not
include a task_definition.

Paragraph 10 says that the elaboration of a task declaration elaborates
the task_definition; what if there isn't one?

Paragraph 11 says the elaboration of a task_definition creates the task
type and its first subtype; if there is no task_definition, when are
the task type and its first subtype created?

The intent seems obvious.  A good fix would be to state that

    task type TT;

is equivalent to

    task type TT is
    end TT;

providing an implicit task_definition.

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