Before we conclude the essential part of this chapter, let us quickly recap all the places where you can plug in code to help XS and SWIG produce a smooth interface (for the script programmer):
-
Perl module
-
So far, the Perl module produced by these tools has been used only to bootstrap the C code, but there's no reason why it shouldn't have some custom subroutines too. The XS example presented earlier, in the "Modifying Parameters" section, could easily have been implemented in Perl space.
-
Typemaps
-
Supply snippets of code to convert between Perl and C data types.
-
Wrapper code in the interface files
-
The
CODE
and
PPCODE
directives allow you to insert a variety of custom translation tasks. In SWIG, you can inline custom C code as follows:
%module FunMath
%inline %{
int factorial(int n){return (n == 1) ? 1 : n *(n -1)};
%}
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