• The Problem
• The Solution
• Usage Example
• First-Last-Subscriber-Notification Mbox is Bound to a Single Message Type
• First-Last-Subscriber-Notification Mbox as MPMC or MPSC mbox
• First-Last-Subscriber-Notification Mbox and Delivery Filters
• make_multi_consumer_mbox, make_single_consumer_mbox, and make_mbox Template Functions