INFINITY or FLOAT_MAX or similar in sheet?

[newbie nullzwei <newbie-02 gmx de>]

 
hello @all,
 
do we have such, or are there any hints how it should be implemented if I need to code it?
 
or an experienced dev who could make it in 'gnumeric style'? 
 
best i could find is:
libgnumeric.c: RLIM_INFINITY,
options.c: infinity = 100000000,
and some functions dealing with DBL_MAX internally.
 
I need to get some functionalities 'datatype independent' ( double vs. long version ),
'nextafter' is a good help for such, and as 'universal target' for calculations 'behind +MAX'
and 'behind -MAX' would be useful. 
 
any help greatly appreciated ...

 
Best Regards,
 
 
 
b.