While installing my small package, I met a tricky problem.
For clarity, let me explain it with the following simplified example.
In ~/pkg/R/aclass.R,
setClass(�aclass�, contains=�bclass�, representation(i=�numeric�))
In ~/pkg/R/bclass.R,
setClass(�bclass�, representation(j=�numeric�))
After building a �pkg� package, the file pkg.R in R directory has:
setClass(�aclass�, contains=�bclass�, representation(i=�numeric�))
setClass(�bclass�, representation(j=�numeric�))
When combining the source files, R seems to generate one new source file
based on alphabetic orders of file names. In this case, loading the "pkg"
package failed with the following error message.
> library(pkg)
Error in methodsPackageMetaName("C", name) :
The name of the object (e.g,. a class or generic function) to find
in the meta-data must be a single string (got an object of class "NULL")
> traceback()
12: methodsPackageMetaName("C", name)
11: classMetaName(Class)
10: getClassDef(Class, where)
9: getClass(cl, TRUE)
8: .validDataPartClass(clDef, name)
7: reconcilePropertiesAndPrototype(name, slots, prototype, superClasses,
where)
6: makeClassRepresentation(Class, properties, superClasses, prototype,
package, validity, access, version, sealed, where = where)
5: setClass("aclass", contains = "bclass", representation(i = "numeric"))
4: eval(expr, envir, enclos)
3: eval(i, envir)
2: sys.source(codeFile, loadenv, keep.source = keep.source)
1: library(pkg)
I suspect the reason is that class �bclass� is not defined when class
�aclass� is defined. To maintain source files effectively, I don�t want to
combine two files into one file or change their file names.
Surely, there may be elegant solutions for this somewhat trivial issue. But,
I can�t find it. Can you help me? Thanks.
Daehyok Shin
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