[gmx-developers] trajana.h trajana.c

[Paolo Franz]

Hello everybody,
For sometimes, I have been developing analysis tools for gromacs
trajectories using the gromacs library. I am puzzled about some definitions
in the file trajana.h, which I do not seem to understand completely. Why
are definitions such as

#define ANA_USE_TOPX         (1<<1)

#define ANA_NOUSER_PBC       (1<<4)

used in the code? What is the purpose of this bitwise shift - why not set
ANA_USE_TOPX and ANA_NOUSER_PBC to 2 and 16 for instance??

Thanks in advance

Paolo
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