Still in development, but if you are interested into looking around,

start with

swigtypemaps.swg

which is the head file. Also read the docs for %fragments in

fragments.swg

and follow the definitions in one of the supported languages:

python, perl, ruby, tcl

/* -----------------------------------------------------------------------------

* Internal typemap specializations

* ----------------------------------------------------------------------------- */

carrays.swg Implement the carrays.i library

cdata.swg Implement the cdata.i library

cmalloc.swg Implement the cmalloc.i library

cpointer.swg Implement the cpointer.i library

cstring.swg Implement the cstring.i library typemaps for char *

cwstring.swg Implement the cstring.i library typemaps for wchar_t *

exception.swg Implement the exception.i library

implicit.swg Allow the use of implicit C++ constructors

string.swg Typemaps for char * string

wstring.swg Typemaps for wchar_t * string

std_string.swg Typemaps for std::string

std_wstring.swg Typemaps for std::wstring

swigtype.swg Typemaps for the SWIGTYPE type

void.swg Typemaps for the 'void' type

enumint.swg Typemaps for enums treated as 'int'

swigobject.swg Typemaps for the SWIG_Object as in PyObject, Tcl_Obj, etc.

misctypes.swg Typemaps for miscellaneos types (size_t, ptrdiff_t, etc)

ptrtypes.swg Typemaps for types with a 'ptr' behavior

valtypes.swg Typemaps for 'by value' types

inoutlist.swg IN/OUTPUT/INOUT typemaps, where the OUTPUT values are returned in a list

primtypes.swg Common macros to manage primitive types (short,int,double,etc)

cstrings.swg Common macros to implemented the cstring/cwstring libraries

std_strings.swg Common macros to implemented the std::string/std::wstring typemaps

strings.swg Common macros and typemaps for string and wstring (char *, wchar_t *)

swigmacros.swg Basic macros

fragments.swg Macros for fragment manipulations

typemaps.swg The old typemaps.i library, not needed anymore