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BTW: we already have SGPropertyNode based inheritance in simgear
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:: That sounds very much like the way Nasal's "multiple-inheritance" mechanism is internally implemented (it traversing a vector named "parents") - while it sounds indeed very powerful, it seems like overkill at this point ? Personally, I'd opt for a simple "version" argument for views (XML + property level) - so that new features can be easily added without breaking anything, if aircraft devs want to use those, it's not too much specify a corresponding <code><version>112</version></code> tag or a corresponding props.Node and increment the version number whenever breaking changes are made to sview, while posting an announcement to the devel list. That would also mean that scripts could be provided to update -set.xml files automatically.--[[User:Hooray|Hooray]] ([[User talk:Hooray|talk]]) 19:59, 4 December 2020 (EST)
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:: That sounds very much like the way Nasal's "multiple-inheritance" mechanism is internally implemented (it traversing a vector named "parents") - while it sounds indeed very powerful, it seems like overkill at this point ? Personally, I'd opt for a simple "version" argument for views (XML + property level) - so that new features can be easily added without breaking anything, if aircraft devs want to use those, it's not too much specify a corresponding <code><version>112</version></code> tag or a corresponding props.Node and increment the version number whenever breaking changes are made to sview, while posting an announcement to the devel list. That would also mean that scripts could be provided to update -set.xml files automatically. BTW, it only just occurred to me that there is already similar SGPropertyNode machinery in simgear/material/Effect.cxx, Tim once implemented effects-inheritance via XML/property trees that way, so you may want to take a look if you're interested in that approach (if in doubt ask Fernando for a more specific pointer). Personally, I think it's more important to expose some dedicated fgcommand tooling to create views from scratch, so that we can run some tests (stability, performance) and maybe get others to stress-test the CV mode. --[[User:Hooray|Hooray]] ([[User talk:Hooray|talk]]) 19:59, 4 December 2020 (EST)

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