tree 9963bd4874919f3a53e0cc2aab0550385fd3ff79
parent ea66c6d8819c8fc5f73a28554992be64e5399fed
author Kevin Wolf <kwolf@redhat.com> 1373292861 +0200
committer Kevin Wolf <kwolf@redhat.com> 1374865811 +0200

qapi: Anonymous unions

The discriminator for anonymous unions is the data type. This allows to
have a union type that allows both of these:

    { 'file': 'my_existing_block_device_id' }
    { 'file': { 'filename': '/tmp/mydisk.qcow2', 'read-only': true } }

Unions like this are specified in the schema with an empty dict as
discriminator. For this example you could take:

    { 'union': 'BlockRef',
      'discriminator': {},
      'data': { 'definition': 'BlockOptions',
                'reference': 'str' } }
    { 'type': 'ExampleObject',
      'data: { 'file': 'BlockRef' } }

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>