Dear R friends,
I am currently trying to write a piece of C code that uses „embedded R“, and
for specific reasons*, I cannot keep track if R already has been initialized.
So the code snippet looks like this:
LibExtern char *R_TempDir;
if(R_TempDir == NULL)
…throw exception R not initialized…
I have seen that the source code of Rf_initialize_R itself checks if it is
ivoked twice (num_initialized), but this latter flag does not seem to
accessible, or is it?
int Rf_initialize_R(int ac, char **av)
{
int i, ioff = 1, j;
Rboolean useX11 = TRUE, useTk = FALSE;
char *p, msg[1024], cmdlines[10000], **avv;
structRstart rstart;
Rstart Rp = &rstart;
Rboolean force_interactive = FALSE;
if (num_initialized++) {
fprintf(stderr, "%s", "R is already initialized\n");
exit(1);
}
Is the test of the TempDir a good substitute, or should I choose another
solution? Having said this, it may be a good idea to expose a function
Rf_R_initialized that performs such a test.
Thank you for your consideration.
Best regards,
Matthias
*The use case is an R library that connects to swi-prolog and allows the
„embedded“ swi-prolog to establish the reverse connection to R. In that case,
i.e., R -> Prolog -> R, I do not want to initialize R a second time.
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