Is there a way to get the number of bits in an mpz_t?

[Sisyphus]

----- Original Message ----- 
From: "Chris Saunders" <evas at mountaincable.net>
To: "Sisyphus" <sisyphus1 at optusnet.com.au>; "GMP-discuss Mailing List" 
<gmp-discuss at gmplib.org>
Sent: Tuesday, September 22, 2009 6:52 PM
Subject: Re: Is there a way to get the number of bits in an mpz_t?


> First, thanks very much for the response Rob.  I didn't see how to get 
> what I was after at first but realized after a minute.  Can I ask you to 
> confirm that calling mpz_sizeinbase (my_mpz, 2) will return what I'm 
> looking for.

Yes, that will do it ... assuming I understand correctly what it is that 
you're "looking for" :-)

For example, it will return '4' for the values 8 to 15 (inclusive).

Cheers,
Rob