mkclass: introduce *.ti class field attribute notify_args #10233
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If specified e.g. on T#foo_bar, then T#SetFooBar(), T#NotifyFooBar() and T::OnFooBarChanged get an additional argument of type `const NotifyFieldArgs<T::NotifyFooBarArgs>&`. That type can be customized like this:
`template<>struct NotifyFieldArgs<T::NotifyFooBarArgs>{int I=42;};`
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If specified e.g. on T#foo_bar, then T#SetFooBar(), T#NotifyFooBar() and T::OnFooBarChanged get an additional argument of type
const NotifyFieldArgs<T::NotifyFooBarArgs>&. That type can be customized like this:template<>struct NotifyFieldArgs<T::NotifyFooBarArgs>{int I=42;};This is the absolute minimum required for my idea #10082 (comment) how to fix this:
Additionally, Checkable#next_check has to use this to pass an additional bool flag across the cluster which triggers Checkable::OnNextCheckUpdated. Compatibility isn't a problem as
Empty, which is returned if a desired Dictionary key is missing, is convertible to bool. So even future versions can just omit the flag if false.