fixed R check

Author: GuangchuangYu

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: tidytree
 Title: A Tidy Tool for Phylogenetic Tree Data Manipulation
-Version: 0.4.5.001
+Version: 0.4.6
 Authors@R: c(
            person("Guangchuang", "Yu",   email = "[email protected]", role = c("aut", "cre", "cph"), comment = c(ORCID = "0000-0002-6485-8781")),
            person("Bradley", "Jones",    email = "[email protected]",             role = "ctb"),

NAMESPACE

@@ -179,6 +179,7 @@ importFrom(methods,isClass)
 importFrom(methods,new)
 importFrom(methods,representation)
 importFrom(methods,setClass)
+importFrom(methods,setClassUnion)
 importFrom(methods,setGeneric)
 importFrom(methods,setOldClass)
 importFrom(methods,show)

NEWS.md

@@ -1,5 +1,6 @@
-# tidytree 0.4.5.001
+# tidytree 0.4.6
 
++ import `methods::setClassUnion()` to fix R check (2023-12-12, Tue)
 + check before `setOldClass()`, which suppose to fix the #47 issue (2023-11-29, Wed)
 
 # tidytree 0.4.5

R/AllClasses.R

@@ -6,6 +6,7 @@ if (!isClass("phylo")) setOldClass("phylo")
 if (!isClass("DNAbin")) setOldClass("DNAbin")
 if (!isClass("AAbin")) setOldClass("AAbin")
 
+#' @importFrom methods setClassUnion
 setClassUnion("DNAbin_Or_AAbin", c("DNAbin", "AAbin", "NULL"))
 
 ##' Class "treedata"