https://github.com/sztomi/constexpr_murmurhash

This is a constexpr implementation of the Murmur3A hash function.
https://github.com/sztomi/constexpr_murmurhash

Last synced: about 2 months ago
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This is a constexpr implementation of the Murmur3A hash function.

• Host: GitHub
• URL: https://github.com/sztomi/constexpr_murmurhash
• Owner: sztomi
• Created: 2015-10-11T21:08:13.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2015-10-14T19:33:06.000Z (almost 9 years ago)
• Last Synced: 2024-07-23T11:08:42.292Z (2 months ago)
• Language: C++
• Size: 110 KB
• Stars: 27
• Watchers: 3
• Forks: 6
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# A `constexpr` Murmur3A hash

This is a constexpr (C++14) implementation or MurMur3A which can be compiled

with clang or gcc. For more details, see my

[blog post](http://szelei.me/constexpr-murmurhash) about this library.

# Usage

This is a header-only library. Include the header `constexpr_murmur3.h` and call

the function `ce_mm3::mm3_x86_32`.

# Is the value returned really a compile-time constant?

Yes. The following code would not compile otherwise:

```cpp

using ce_mm3::mm3_x86_32;

template

struct printer

{

    printer() { std::cout << N << std::endl; }

};

printer p;

```

# Is this code well-formed according to the standard?

To be honest, I'm not entirely sure. I am not using any `reinterpret_cast`s which

would be the main culprit in implementing hash functions that deal operate on

blocks of data. Feel free to comment on my

[post](http://szelei.me/constexpr-murmurhash) if you have any input on the issue.