converting from GMP to QD

[Décio Luiz Gazzoni Filho]

On Aug 1, 2012, at 2:16 AM, Marc Glisse <marc.glisse at inria.fr> wrote:

> On Tue, 31 Jul 2012, Pasquale Tricarico wrote:
> 
>> Hi,
>> 
>> I am currently using both GMP and QD libraries, converting from mpz to
>> dd_real using something like this:
> 
> Is QD documented anywhere?
> 
>>   dd_real mpzToDD(const mpz_class & z) {
>>       char * str = (char *)malloc(mpz_sizeinbase(z.get_mpz_t(),10)+2);
>>       mpz_get_str(str,10,z.get_mpz_t());
>>       dd_real x(str);
>>       free(str);
>>       return x;
>>   }
> 
> You know, z.get_str() would save you a bit of typing.
> 
>> I would be interested in knowing if there is a more efficient way to do this.
> 
> If QD documents the storage format of dd_real, you may be able to use mpz_export in some way.
> 

Another suggestion would be to export to a string in base 16 since that doesn't require an explicit calculation, as converting to base 10 would. That's assuming that QD is capable of parsing base-16 integers. 

Décio

> -- 
> Marc Glisse
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