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The Rcpp package provides C++ classes that greatly facilitate
interfacing C or C++ code in R packages using the .Call() interface
provided by R.
Rcpp provides matching C++ classes for a large number of basic R
data types. Hence, a package author can keep his data in normal R
data structures without having to worry about translation or
transferring to C++. At the same time, the data structures can be
accessed as easily at the C++ level, and used in the normal manner.
The mapping of data types works in both directions. It is as
straightforward to pass data from R to C++, as it is it return data
from C++ to R.
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