C++ 128/256-bit fixed size integer types

Question

I was wondering if any fellow SO\'s could recommend a good light-weight fixed size integer type (128-bit or even 256-bit, possibly even template parametrized) library.

Answer 1

The Boost library has data types as part of multiprecision library, for types ranging from 128 to 1024 bits.

#include 

using namespace boost::multiprecision;

int128_t mySignedInt128 = -1;
uint128_t myUnsignedInt128 = 2;
int256_t mySignedInt256 = -3;
uint256_t myUnsignedInt256 = 4;
int512_t mySignedInt512 = -5;
uint512_t myUnsignedInt512 = 6;
int1024_t mySignedInt1024 = -7;
uint1024_t myUnsignedInt1024 = 8;