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This avoids copying the pointers from Client::Impl into Connection, which is just administrative work. Now we can access Client::Impl, and have all variables available to us.
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Last commit the hope was the {} alone was enough, but SonarCloud, somewhat rightfully, still complains.
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By using Happy Eyeballs, we stagger connections of a host resolves into multiple IPs. This is useful for IPv6 / IPv4 hosts, where one of the two can stutter. Sadly, creating a connection is rather complex, with many odd things that can happen along the way. For example, a writeable socket doesn't mean it is actually connected; it can also mean the socket is in an error state. This implementation is inspired by my own work on OpenTTD's variant of this.
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All administration should been taken care of now, and the only thing remaining is creating connect/disconnect and implementing the sendXXX functions.
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This contains no actual code yet, just the scaffolding to get started.