https://github.com/calccrypto/uint256_t

C++ unsigned 256 bit integer type
https://github.com/calccrypto/uint256_t

c-plus-plus unsigned-integers

Last synced: 7 days ago
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C++ unsigned 256 bit integer type

• Host: GitHub
• URL: https://github.com/calccrypto/uint256_t
• Owner: calccrypto
• License: mit
• Created: 2014-01-29T21:42:31.000Z (almost 11 years ago)
• Default Branch: master
• Last Pushed: 2024-05-08T17:05:07.000Z (6 months ago)
• Last Synced: 2024-08-01T22:44:43.229Z (4 months ago)
• Topics: c-plus-plus, unsigned-integers
• Language: C++
• Homepage:
• Size: 155 KB
• Stars: 171
• Watchers: 9
• Forks: 41
• Open Issues: 4
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# uint256_t

An unsigned 256 bit integer type for C++

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

Please see LICENSE file for license.

[![uint256_t](https://github.com/calccrypto/uint256_t/actions/workflows/uint256_t.yml/badge.svg)](https://github.com/calccrypto/uint256_t/actions/workflows/uint256_t.yml)

## 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.

## Usage

This is simple implementation of an unsigned 256 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++.

`uint256_t` requires [`uint128_t`](https://github.com/calccrypto/uint128_t), which is included.

### In Code

All that needs to be done in code is `#include "uint256_t.h"`

```c++

#include 

#include "uint256_t.h"

int main() {

    uint256_t a = 1;

    uint256_t b = 2;

    std::cout << (a | b) << std::endl;

    return 0;

}

```

### Compilation

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

Compilation can be done by directly including `uint128_t.cpp` and `uint256_t.cpp` in your compile command, e.g. `g++ -std=c++11 main.cpp uint128_t.cpp uint256_t.cpp`, or other ways, such as linking the `uint128_t.o` and `uint256_t.o` files, or creating a library, and linking the library in.