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

c++ types bigint
Matthieu N. picture Matthieu N. · Mar 9, 2011 · Viewed 18.2k times · Source

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.

I've had a look at GMP and co, they care great, yet are a bit too large for my purposes, I'm interested in simple header only solutions at this point. Performance is important and the target architecture will be x86 and x86-64, also a reasonable license (aka nothing GPL or LGPL).

Answer

Tuxdude picture Tuxdude · Feb 25, 2015

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

#include <boost/multiprecision/cpp_int.hpp>

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;

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