In the Rcpp 0.10.0, inst/include/Rcpp/sugar/logical/SingleLogicalResult.h there is the code:
template <bool x> class conversion_to_bool_is_forbidden : conversion_to_bool_is_forbidden<x>{ Which obviously can't be instantiated. Presumably the code should be: template <bool x> class conversion_to_bool_is_forbidden : forbidden_conversion<x>{ Thanks, Karl
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