long long support

Marc Glisse marc.glisse at inria.fr
Sun Jan 24 10:26:21 UTC 2021

On Fri, 22 Jan 2021, William Morriss wrote:

> I am using gmpxx and I noticed that long longs, particularly uint64_t, were
> not supported, and that the documentation also notes this gap. I am
> wondering whether this is because of some real limitation or just missing
> functionality. It seems to have been missing for a long time even though
> long long was standardized in C++11. I would also consider adding the
> support myself.

The main issue is that support for long long is missing in GMP itself (the 
C part). And it is missing because GMP is still officially a C89 library. 
There are plans to move it to C99, but I don't think the work to add long 
long has been done yet. The main platform where long long support would be 
beneficial is win64 because of their weird choice of 32-bit long (although 
it would still be nice on other platforms).

Once long long is in GMP, adding it to the C++ wrappers should be easy 

Marc Glisse

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