Facilitating language interoperability
Although Julia can be used to write most kinds of code, there are mature libraries for numerical and scientific computing which we would like to exploit. These libraries can be in C, Fortran or Python. Julia allows the ease of using the existing code written in Python, C, or Fortran. This is done by making Julia perform simple and efficient-to-call C, Fortran, or Python functions.
The C/Fortran libraries should be available to Julia. An ordinary but valid call with ccall is made to this code. This is possible when the code is available as a shared library. Julia's JIT generates the same machine instructions as the native C call. Therefore, it is generally no different from calling through a C code with a minimal ...
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