Hi, I am trying to figure a way to allocate a string SEXP so that gc() won't ever collect it. Here is a little bit of a background. Suppose I want to write a .Call-callable function that upon each call returns the same value, say mkChar("foo"): SEXP getFoo() { return mkChar("foo"); } The above implementation doesn't take advantage of the fact that mkChar("foo") could be pre-computed only once, and then the function would return the pre-computed value. So the question is how to create this precomputed value. The closest thing I could find in the sources is R_NaString, but I was not able to trace down how it comes about. Thanks, Vadim P.S. I was able to solve a similar problem with symbols. If I need a symbol "foo", I do static SEXP FooSymbol = install("foo"); and then use FooSymbol instead of install("foo")
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