[gambit-list] ffi double constants

Álvaro Castro-Castilla alvaro.castro.castilla at gmail.com
Mon Feb 20 06:42:21 EST 2012


Hi,

I want to use the M_PI constant, which is defined in C as #define M_PI
3.14159265358979323846, with 21 decimals. For the Cairo bindings, the
full precision is needed, because drawing a circle is done by drawing
an arc 2*M_PI long, and the algorithm only considers it a circle when
the 2*pi is passed with the proper precision.
What's the way to support this precision for the FFI bindings, so I
can pass that value to the affected functions as it is done in C
without a special wrapper function for each case?

Best regards,

Álvaro



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