Exchange context flags API is very verbose

[bzbarsky-apple]

Problem

ExchangeContext::SendMessage takes a flags arg of type SendFlags, which is a BitFlags<SendMessageFlags>

That means every call to this API has an arg that looks like SendFlags(SendMessageFlags:kSomething).

Proposed Solution

It looks like the BitFlags constructor that takes the enum value is explicit, but we could add overloads of SendMessage that take SendMessageFlags directly as a last arg to cut down on the extra verbosity at callsites.... Callsites that need more than one flag will still need to do something, of course (though if we wanted to we could make these overloads variadic templates that pass through all the remaining args to the SendFlags ctor.

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.