50 lines
1.5 KiB
Markdown
50 lines
1.5 KiB
Markdown
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# uint256_t
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An unsigned 256 bit integer type for C++
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Copyright (c) 2013 - 2018 Jason Lee @ calccrypto at gmail.com
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Please see LICENSE file for license.
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[](https://github.com/calccrypto/uint256_t/actions/workflows/uint256_t.yml)
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## Acknowledgements
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With much help from Auston Sterling
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Thanks to Stefan Deigmüller for finding
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a bug in operator*.
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Thanks to François Dessenne for convincing me
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to do a general rewrite of this class.
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Thanks to John Skaller for making symbols visible
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when compiling as a shared library.
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## Usage
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This is simple implementation of an unsigned 256 bit
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integer type in C++. It's meant to be used like a standard
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`uintX_t`, except with a larger bit size than those provided
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by C/C++.
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`uint256_t` requires [`uint128_t`](https://github.com/calccrypto/uint128_t), which is included.
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### In Code
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All that needs to be done in code is `#include "uint256_t.h"`
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```c++
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#include <iostream>
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#include "uint256_t.h"
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int main() {
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uint256_t a = 1;
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uint256_t b = 2;
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std::cout << (a | b) << std::endl;
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return 0;
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}
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```
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### Compilation
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A C++ compiler supporting at least C++11 is required.
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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.
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