This library contains an extensible framework for implementing hashing algorithms that can support user-defined types, based on the paper "Types don't know #" by Howard Hinnant, Vinnie Falco and John Bytheway.

It also contains implementations of several popular hashing algorithms:

The hashing algorithms conform to the following concept:

struct HashAlgorithm
{
    using result_type = /*integral or array<unsigned char, N>*/; // result type

    HashAlgorithm(); // default-constructible
    explicit HashAlgorithm( uint64_t seed ); // seed-constructible
    HashAlgorithm( void const* seed, size_t n ); // seed-constructible

    HashAlgorithm( HashAlgorithm const& r ); // copy-constructible
    HashAlgorithm& operator=( HashAlgorithm const& r ); // assignable

    void update( void const* data, size_t n ); // feed bytes

    result_type result(); // obtain result; also advances state,
                          // and can be called multiple times
};

See the documentation for more information.

Supported compilers

The library requires C++11. The following compilers:

g++ 4.8 or later
clang++ 3.9 or later
Visual Studio 2015 and above

are being tested on Github Actions and Appveyor.

License

Distributed under the Boost Software License, Version 1.0.