64bit integer literals on 32bit platforms

[Gereon Kremer]

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Hi,

We once again run into this issue. This time, we have troubles with
std::int64_t and alike being typedef'd differently on different platforms.
This is only a problem with gmp though, as everything else just works
fine with both long and long long.

Could these constructors make it into 6.1?
As far as I understand it, it shouldn't be a big problem because it's
just another type name for the very same data, right?

Best,
Gereon

On 10/29/2015 09:19 PM, Marc Glisse wrote:
> On Thu, 29 Oct 2015, Gereon Kremer wrote:
>
>> We are using gmp in a library project that is supposed to work on both
>> 32bit and 64bit platforms.
>> However, we ran into problem when we used integer literals that are
>> larger than 2^32 (say 10000000000).
>> Consider the following code:
>>
>> #include <gmpxx.h>
>> int main() {
>> mpz_class x(10000000000);
>> }
>>
>> On 64bit platforms, everything will be fine. On 32bit however, gmp only
>> provides constructors from char, short, int and long int, but not long
>> long int. Thus, compilers (g++, clang++) will tell you that the
>> constructor is ambiguous.
>>
>> Tested on Ubuntu 14.04 (32bit), prepackaged gmp 5.1.3, g++ 4.8.2,
>> clang++ 3.4
>
> We should eventually support long long...
> Note that you could use strings for numbers of arbitrary size:
> mpz_class
x("10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000");
> or in C++11:
> mpz_class
x=10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000_mpz;
>

- -- 
Gereon Kremer
Lehr- und Forschungsgebiet Theorie Hybrider Systeme
RWTH Aachen
Tel: +49 241 80 21243
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