Portable implementations of signed and unsigned 128-bit integers

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int128 is under active development and is not an official boost library.

This library is header only. It contains no other dependencies. Simply #include it and use it.

git clone https://github.com/cppalliance/int128 cd int128 mkdir build && cd build cmake .. OR cmake .. -DCMAKE_INSTALL_PREFIX=/your/custom/path cmake --build . --target install

then you can use find_package(boost_int128 REQUIRED)

git clone https://github.com/cppalliance/int128 cd int128 vcpkg install int128 --overlay-ports=ports/int128 

Boost.Int128 is tested natively on Ubuntu (x86_64, x86_32, s390x, aarch64, ARM32v7), macOS (x86_64, and Apple Silicon), and Windows (x86_64, x86_32, and ARM64); as well as emulated PPC64LE using QEMU with the following compilers:

• GCC 5 and later
• Clang 5 and later
• Visual Studio 2017 (14.1) and later
• Intel OneAPI DPC++

Int128 provides 2 types:

namespace boost { namespace int128 { struct uint128_t; struct int128_t; } //namespace int128 } //namespace boost

These types operate like built-in integer types. They have their own implementations of the Standard-Library functions (e.g. like those found in <limits>, <iostream>, <bit> etc.).

The entire library can be conveniently included with #include <boost/int128.hpp>

The complete documentation can be found at: https://master.int128.cpp.al

[1] Donald E. Knuth, The Art of Computer Programming Volume 2 Seminumerical Algorithms, 3rd edition, 1998