(earlier I sent it as html by mistake).
Hi,
How can I get from C an object name used as a function argument? I
have sample code in C that gives me access to the name of the function
being called:
SEXP xname(SEXP x)
{
const char *fun_name = CHAR(PRINTNAME(CAR(x)));
x = CDR(x);
const char *arg_name = isNull(TAG(x)) ? "" : CHAR(PRINTNAME(TAG(x)));
Rprintf("fn_name: %s, arg_name: %s\n", fun_name, arg_name);
return R_NilValue;
}
> xname <- function(...) invisible(.External("xname", ...))
>
> x1 = 123
>
> xname(x1)
fn_name: xname, var_name:
However, I am trying to find a way to access the object name. In the
documentation I found a solution for named args:
> xname(arg = x1)
fn_name: xname, var_name: arg
And I'd like to find the equivalent in C for substitute():
> substitute(x1)
x1
Best regards,
Daniel
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