uint128_t

An unsigned 128 bit integer type for C++

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

Please see LICENSE file for license.

Acknowledgements

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.

Usage

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++.

In Code

All that needs to be done in code is #include "uint128.h"

#include <iostream>
#include "uint128.h"

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

Compilation

A C++ compiler supporting at least C++23 is required.

This library is header-only, so no compilation is required. However, if you want to build and run tests, you need to compile the library. Compilation can be done by using cmake toolchain.

1. mkdir build && cd build
2. cmake -DWITH_TESTS=ON ..
3. ninja
4. ctest