[R] Error messages and C
ross at biostat.ucsf.edu
Fri Aug 20 20:35:24 CEST 2004
I am calling a C (C++ really) function via the .C interface.
Sometimes when things go wrong I want to return an error message.
1. R provides C functions error and warning which look about right.
But exactly how does this exit, and in particular what happens with
cleaning up, calling C++ destructors, and unwinding the stack? Will I
get memory leaks?
2. Before I discovered those functions, I looked at passing in a
character vector as an argument, char ** p in the C code. Exactly how
do I use these things? Am I supposed to allocate a string and stuff the
pointer in the function argument? Or should I assume *p points to valid
space (how much?) and fill it in?
Ross Boylan wk: (415) 502-4031
530 Parnassus Avenue (Library) rm 115-4 ross at biostat.ucsf.edu
Dept of Epidemiology and Biostatistics fax: (415) 476-9856
University of California, San Francisco
San Francisco, CA 94143-0840 hm: (415) 550-1062
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