[ADOL-C] Signature of Hessian driver

[Philipp Bender]

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Dear list,

I wonder about the declaration of the hessian() function: why is the
pointer to the values x not const, is there a special reason? The
gradient() function for example leaves the input values const.

drivers.h:
ADOLC_DLL_EXPORT int hessian(short,int,double*,double**);
ADOLC_DLL_EXPORT int gradient(short,int,const double*,double*);

The same applies to function(), not const.

Actually I have not tried to fix this because I am in a very early
stage using ADOL-C, and I'm a little bit afraid of breaking it (making
it compile, but get some strange side effects).

Best regards,
Philipp Bender
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