[Users] extent in HyperSlab

[jtao at cct.lsu.edu]

I am in a process of converting a code to use the new
HyperSlab interface. The only thing I am not sure at
this moment is the argument extent in the function
Hyperslab_GlobalMappingByIndex (...).

I believe it is corresponding to the argument
length in the old function Hyperslab_GetHyperslab(...).

In a situation that the length is unknown, one can set
length = -1 to let the function to determine what it should be.
However in the new interface, one has no such a choice (please
correct me if I am wrong). Are there any recommended solutions
to deal with an unknown extent ?

Thanks in advance,
Jian