Hello
We have a C++ class with several methods that manipulate an object. How is it
possible to create several instances of that class *from R* in the C++ realm,
which can then be accessed via a given name character? Symbolic example (we
hope this illustrates our problem):
// C++ side:
class Foo{
...
}
// perhaps:
void my_new_instance_wrapper("the_character") // plain to see that I am no C++
programmer ;-)
{
static Foo "the_character"; // no return needed since we know the name of the
instance = "the_character"
}
# R side:
create_new_instance <- function(name){
dono_what_to_use_here(???, class)
}
# perhaps:
create_new_instance <- function(name){
.C("my_new_instance_wrapper", as.character(name))
}
dyn.load("Foo")
obj1 <- create_new_instance("bar", class="Foo")
obj2 <- create_new_instance("baz", class="Foo")
str(obj1)
: character which can be manipulated using class methods in the C++ realm
What we do not want: make simple copies of the object in R; use Rcpp modules
(we tried that without success, pointers in constructors cause trouble);
re-write our code such that C++ only "works off" heavy code, the rest is
R-side. What we want: interfacing (from the R-side) instances of our class
where the instances exist in the C++ realm.
Either there is a function (or code) in R that solve this task, perhaps by
returning pointers to instances of C++ classes. (Or there is a possibility to
create a wrapper in C++ creating a new instance, the wrapper we do not know of.)
Thanks for any notes, tips, experiences.
Sören and Carlo
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