Le 29/07/2022 à 23:43, Roberto Spadim a écrit :
I don't know if I'm clear in last message
What I want to do is something like this, but i don't know if Rcpp can
'convert' the ifstream to SEXP and keep the object intact:
XPtr was designed to wrap any C++ pointer to SEXP structure and make a
backward conversion too. So I would start with this kind of helper.
For example, see
https://www.r-bloggers.com/2010/01/external-pointers-with-rcpp/
You have to pay a particular attention to what should happen if on R
side, your pointer-wrapper goes out of scope and thus becomes a subject
to garbage collection. Should your ifstream be destroyed automatically
at this moment or you will do it later by yourself?
Best,
Serguei.
One RCPP function to open the file and return the "ifstream" object
ifstream some_open_function(){
ifstream infile;
infile.open("afile.dat");
return infile;
}
one read function:
string read_file(ifstream infile){
string data;
infile >> data;
return data;
}
one close function:
void close_file(ifstream infile){
infile.close();
}
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