An unsigned 128 bit integer type for C++

Copyright (c) 2013 - 2018 Jason Lee @ calccrypto at gmail.com

Please see LICENSE file for license.

With much help from Auston Sterling

Thanks to Stefan Deigmüller for finding a bug in operator*.

Thanks to François Dessenne for convincing me to do a general rewrite of this class.

Thanks to John Skaller for making symbols visible when compiling as a shared library. This was originally done in uint256_t, which I copied into here.

This is simple implementation of an unsigned 128 bit integer type in C++. It's meant to be used like a standard uintX_t, except with a larger bit size than those provided by C/C++.

All that needs to be done in code is #include "uint128_t.h"

#include <iostream>
#include "uint128_t.h"

int main() {
    uint128_t a = 1;
    uint128_t b = 2;
    std::cout << (a | b) << std::endl;
    return 0;
}

A C++ compiler supporting at least C++11 is required.

Compilation can be done by directly including uint128_t.cpp in your compile command, e.g. g++ -std=c++11 main.cpp uint128_t.cpp, or other ways, such as linking the uint128_t.o file, or creating a library, and linking the library in.