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qapi: Introduce a first class 'null' type

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I expect the 'null' type to be useful mostly for members of alternate
types.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2017-06-26 19:25:14 +02:00
parent d2f95f4d48
commit 4d2d5c41a9
8 changed files with 31 additions and 8 deletions
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10
docs/devel/qapi-code-gen.txt
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@ -282,6 +282,7 @@ The following types are predefined, and map to C as follows:
size uint64_t like uint64_t, except StringInputVisitor
accepts size suffixes
bool bool JSON true or false
null QNull * JSON null
any QObject * any JSON value
QType QType JSON string matching enum QType values
@ -536,10 +537,11 @@ can only express a choice between types represented differently in
JSON. If a branch is typed as the 'bool' built-in, the alternate
accepts true and false; if it is typed as any of the various numeric
built-ins, it accepts a JSON number; if it is typed as a 'str'
built-in or named enum type, it accepts a JSON string; and if it is
typed as a complex type (struct or union), it accepts a JSON object.
Two different complex types, for instance, aren't permitted, because
both are represented as a JSON object.
built-in or named enum type, it accepts a JSON string; if it is typed
as the 'null' built-in, it accepts JSON null; and if it is typed as a
complex type (struct or union), it accepts a JSON object. Two
different complex types, for instance, aren't permitted, because both
are represented as a JSON object.
The example alternate declaration above allows using both of the
following example objects: