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...PEOF. However, this is soon going to be > disallowed in packages. Would you mind providing an example where a package needs to take an existing LISTSXP and convert it to a LANGSXP (or vice versa)? I think that Luke Tierney intended to replace the uses of SET_TYPEOF(allocList(...), LANGSXP) with allocLang(...). At least it's easy to manually convert between the two by replacing the head of the list using LCONS(CAR(list), CDR(list)) or CONS(CAR(lang), CDR(lang)): in a call, the rest of the arguments are ordinary LISTSXPs. -- Best regards, Ivan

...tal function tools:::funAPI(): > head(tools:::funAPI()) name loc apitype 1 Rf_AdobeSymbol2utf8 R_ext/GraphicsDevice.h eapi 2 alloc3DArray WRE api 3 allocArray WRE api 4 allocLang WRE api 5 allocList WRE api 6 allocMatrix WRE api The 'apitype' field has three possible levels | api | stable (ideally) API | | eapi | experimental API | | emb | embeddin...

...gt; head(tools:::funAPI()) > name loc apitype > 1 Rf_AdobeSymbol2utf8 R_ext/GraphicsDevice.h eapi > 2 alloc3DArray WRE api > 3 allocArray WRE api > 4 allocLang WRE api > 5 allocList WRE api > 6 allocMatrix WRE api > > The 'apitype' field has three possible levels > > | api | stable (ideally) API | > | eapi | experimental...

...gt; head(tools:::funAPI()) > name loc apitype > 1 Rf_AdobeSymbol2utf8 R_ext/GraphicsDevice.h eapi > 2 alloc3DArray WRE api > 3 allocArray WRE api > 4 allocLang WRE api > 5 allocList WRE api > 6 allocMatrix WRE api > > The 'apitype' field has three possible levels > > | api | stable (ideally) API | > | eapi | experimental...

Hi, A common idiom in the R sources is to convert objects between LANGSXP and LISTSXP by using SET_TYPEOF. However, this is soon going to be disallowed in packages. From what I can see, there isn't currently a direct way to convert between these two object types using the available API. At the R level, one can convert calls to pairlists with: >

...gt; head(tools:::funAPI()) > name loc apitype > 1 Rf_AdobeSymbol2utf8 R_ext/GraphicsDevice.h eapi > 2 alloc3DArray WRE api > 3 allocArray WRE api > 4 allocLang WRE api > 5 allocList WRE api > 6 allocMatrix WRE api > > The 'apitype' field has three possible levels > > | api | stable (ideally) API | > | eapi | experimental...

...; ? ? ? ? ? ? ? ? ? ? ?name? ? ? ? ? ? ? ? ? ? loc apitype > ? ? ?1 Rf_AdobeSymbol2utf8 R_ext/GraphicsDevice.h? ? eapi > ? ? ?2? ? ? ? alloc3DArray? ? ? ? ? ? ? ? ? ? WRE? ? ?api > ? ? ?3? ? ? ? ? allocArray? ? ? ? ? ? ? ? ? ? WRE? ? ?api > ? ? ?4? ? ? ? ? ?allocLang? ? ? ? ? ? ? ? ? ? WRE? ? ?api > ? ? ?5? ? ? ? ? ?allocList? ? ? ? ? ? ? ? ? ? WRE? ? ?api > ? ? ?6? ? ? ? ?allocMatrix? ? ? ? ? ? ? ? ? ? WRE? ? ?api > > The 'apitype' field has three possible levels > > ? ? ?| api? | stable (ideally) API | >...

...name loc apitype > > 1 Rf_AdobeSymbol2utf8 R_ext/GraphicsDevice.h eapi > > 2 alloc3DArray WRE api > > 3 allocArray WRE api > > 4 allocLang WRE api > > 5 allocList WRE api > > 6 allocMatrix WRE api > > > > The 'apitype' field has three possible levels > > > > | api |...