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#include "cpp11/doubles.hpp"

[[cpp11::register]] SEXP cpp11_push_and_truncate_(SEXP size_sexp) {

R_xlen_t size = INTEGER(size_sexp)[0];

// Allocate `size` worth of doubles (filled with garbage data)

cpp11::writable::doubles out(size);

// Push 1 more past the existing length/capacity,

// doubling the capacity for cpp11 vectors

out.push_back(0);

// Truncate back to `size + 1` size and return result.

return SEXP(out);

}

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