`subscribe`

virtual SubscriptionHandle subscribe(ChannelHandle channel, const SubscriberDescription &subscriber) noexcept=0

Parameters

Name	Type
`channel`	`ChannelHandle`
`subscriber`	`const SubscriberDescription &`

SubscriptionHandle

The subscription, or an invalid handle for an invalid channel.

Adds a subscriber that the drain of its phase calls per batch.

Precondition

The caller is the main thread.