Saturday, May 5, 2012

pass a matrix into a (language-neutral) math DLL

The argument passing convention might be different between languages. For our math DLL to be callable from fortran/C (the 2 basic languages for numerical computing?), I feel the lowest common denominator is a pointer to a buffer.

 

Caller would populate the buffer with the numbers of the matrix. Each number should be in a language-neutral binary format, following a specific bit layout, in case different languages represent a double differently. Something like 53 bits for the fraction, and 11 bits for the exponent.

 

Then caller invokes the library routine passing in the address. Inside the routine, we read the buffer to reconstruct the matrix into our own proprietary (C++) matrix<double> instance and proceed. After this point, we are in c++ land and need not worry about other languages.

 

(purely my personal design.)

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