dotCall64: An Efficient Interface to Compiled C/C++ and Fortran Code Supporting Long Vectors

摘要

The R functions .C() and .Fortran() can be used to call compiled C/C++ andFortran code from R. This so-called foreign function interface is convenient,since it does not require any interactions with the C API of R. However, itdoes not support long vectors (i.e., vectors of more than 2^31 elements). Toovercome this limitation, the R package dotCall64 provides .C64(), which can beused to call compiled C/C++ and Fortran functions. It transparently supportslong vectors and does the necessary castings to pass numeric R vectors to64-bit integer arguments of the compiled code. Moreover, .C64() features amechanism to avoid unnecessary copies of function arguments, making itefficient in terms of speed and memory usage.