fix ListOf compile by not relying on get__() in attribute accessors#1484
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AttributeProxyPolicy is a base class whose CLASS template parameter need not provide get__() (that comes from the storage policy). ListOf inherits AttributeProxyPolicy without a storage policy, so hasAttribute() and attributeNames() failed to compile for it. Use the operator SEXP() conversion every such class provides instead, matching the existing R_getAttribNames() call. Fixes #1483.
eddelbuettel
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Jun 26, 2026
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Nice!
Usual micro nit: ChangeLog entry in two lines, if we can?
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In #1464 I already removed a couple of them to rely on SEXP for ListOf, so it only makes sense to do the same here. |
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No (new) issues in reverse dependency checks. |
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Fixes #1483.
Problem
AttributeProxyPolicy<CLASS>is a policy base class. ItsattributeNames()andhasAttribute()members fetched the underlyingSEXPviastatic_cast<const CLASS&>(*this).get__(). Butget__()is not part of this policy -- it is provided by the storage policy (PreserveStorage/NoProtectStorage).Vector,XPtrand the macro-generated classes inherit a storage policy, so they haveget__();ListOf<T>inheritsAttributeProxyPolicywithout a storage policy and has onlyget()/operator SEXP().As a result, e.g.
RestRserve'sx.hasAttribute("names")on aListOf<...>failed to compile under R >= 4.6.0:Fix
Drop
.get__()and rely on the implicitoperator SEXP()conversion that all of these classes provide. This matches the adjacentR_getAttribNames(static_cast<const CLASS&>(*this))call (which already worked forListOf) and is equivalent to the pre-4.6.0.attr()path. Both the R >= 4.6.0hasAttribute()and the pre-4.6.0attributeNames()spot are fixed (the latter had the same latent bug forListOf).Tests
Added
listof_has_attr/listof_attribute_namesexports and corresponding cases intest_listof.R. Fulltest_listof.Rpasses (20 results).