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qapi: Drop string input visitor method optional()

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visit_optional() is to be called only between visit_start_struct() and
visit_end_struct().  Visitors that don't support struct visits,
i.e. don't implement start_struct(), end_struct(), have no use for it.
Clarify documentation.

The string input visitor doesn't support struct visits.  Its
parse_optional() is therefore useless.  Drop it.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1488544368-30622-16-git-send-email-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2017-03-03 13:32:35 +01:00
parent a9fc37f6bc
commit a8aec6de2a
2 changed files with 2 additions and 15 deletions
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4
include/qapi/visitor-impl.h
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@ -102,8 +102,8 @@ struct Visitor
/* Must be set to visit explicit null values. */
void (*type_null)(Visitor *v, const char *name, Error **errp);
/* Must be set for input visitors, optional otherwise. The core
* takes care of the return type in the public interface. */
/* Must be set for input visitors to visit structs, optional otherwise.
The core takes care of the return type in the public interface. */
void (*optional)(Visitor *v, const char *name, bool *present);
/* Must be set */