On 4/7/2021 3:38 PM, Anil Muthigi via Boost-users wrote:
I said that I am not sure if boost::variant supports __int128 because I
had difficulties in compiling this code :
1.
#include <boost/variant.hpp>
2.
#include <string>
3.
#include <iostream>
4.
std::ostream& operator<<(std::ostream& o, const __int128& x) { if (x
== std::numeric_limits<__int128>::min()) return o <<
"-170141183460469231731687303715884105728"; if (x < 0) return o <<
"-" << -x; if (x < 10) return o << (char)(x + '0'); return o << x /
10 << (char)(x % 10 + '0'); }
5.
int main()
6.
{
7.
boost::variant<__int128, char, std::string> v;
8.
v = 56;
9.
v = 'Y';
10.
__int128 d=12;
11.
std::cout <<d << '\n';
12.
std::cout << v << '\n';
13.
v = "Yashaswi raj";
14.
std::cout << v << '\n';
15.
}
If u replace __int128 with int in the variant variable, it seems to work
just fine...
As others have pointed out, the correct code is:
#include <boost/variant.hpp>
#include <string>
#include <iostream>
namespace std
{
std::ostream& operator<<(std::ostream& o, const __int128& x)
{
if (x == std::numeric_limits<__int128>::min()) return o <<
"-170141183460469231731687303715884105728";
if (x < 0) return o << "-" << -x;
if (x < 10) return o << (char)(x + '0');
return o << x / 10 << (char)(x % 10 + '0');
}
}
int main()
{
boost::variant<__int128, char, std::string> v;
v = static_cast<__int128>(56);
v = 'Y';
__int128 d=12;
std::cout << d << '\n';
std::cout << v << '\n';
v = "Yashaswi raj";
std::cout << v << '\n';
return 0;
}
So __int128 does indeed work with variant, as I originally surmised.
On Thu, 8 Apr 2021, 00:10 Edward Diener via Boost-users,
<boost-users@lists.boost.org <mailto:boost-users@lists.boost.org>> wrote:
On 4/7/2021 2:15 PM, Anil Muthigi via Boost-users wrote:
> I dont think so...
If it is available why do you think variant would not support it ?
> I guess int128_t under boost/multiprecision/cpp_int is the only
viable
> option.
>
> On Wed, 7 Apr 2021, 11:39 pm David Frank via Boost-users,
> <boost-users@lists.boost.org <mailto:boost-users@lists.boost.org>
<mailto:boost-users@lists.boost.org
<mailto:boost-users@lists.boost.org>>> wrote:
>
> especially the gnu __int128?
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