google_hash | wrapper for google 's hash functions , for ruby | Hashing library

by rdp C++ Version: Current License: BSD-3-Clause

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kandi X-RAY | google_hash Summary

google_hash is a C++ library typically used in Security, Hashing, Ruby On Rails applications. google_hash has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Its goal. To boldly be faster than any ruby hash has before (cue star trek TNG theme…). Well, really the goal is a better hash for Ruby, either one that is faster or more space efficient than ruby’s default. To attempt to accomplish this, this library wraps the google hash sparse and dense hashes [1], which may perform better for your use case [make sure to benchmark before and after!]. It also creates some "specialized" hashes, for instance, those that take an integer for their key, for even better performance and decreased "garbage collected" RAM use, which can significantely speed up certain apps.

Support

Quality

Security

License

Reuse

Support

google_hash has a low active ecosystem.

It has 94 star(s) with 16 fork(s). There are 5 watchers for this library.

It had no major release in the last 6 months.

There are 14 open issues and 28 have been closed. On average issues are closed in 370 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of google_hash is current.

Quality

google_hash has no bugs reported.

Security

google_hash has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

google_hash is licensed under the BSD-3-Clause License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

google_hash releases are not available. You will need to build from source code and install.

Installation instructions are available. Examples and code snippets are not available.

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google_hash Key Features

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google_hash Examples and Code Snippets

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Community Discussions

Trending Discussions on google_hash

C++: using an iterator of dense_hash_set after erase(*it)

QUESTION

C++: using an iterator of dense_hash_set after erase(*it)

Asked 2019-Jan-29 at 15:28

I have this C++ code file which is FOSS under the Expat licence. When running cppcheck on the code I get this error:

[google_hash.cpp:137] -> [google_hash.cpp:141]: (error) Iterator 'it' used after element has been erased.

The code in question is:

...

ANSWER

Answered 2019-Jan-29 at 15:28

It's a false positive in the sense that cppcheck thinks that an API called erase on an iterator invalidates the iterator. That's the rule that it uses, because that's a sensible API.

Then for this code, it seems to be valid to do ++it because of this:

This is implemented by making erase() not resize the hashtable. If you desire maximum space efficiency, you can call resize(0) after a string of erase() calls, to force the hashtable to resize to the smallest possible size.

This seems to mean that the iterators may encounter deleted objects if you don't call resize(0) between erasures. Here it's fine because erasures are done in the same loop.

The fact that this code hides its behavior by not making it obvious and doesn't use standard patterns doesn't help.

Source https://stackoverflow.com/questions/54423612

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install google_hash

gem install google_hash (if on windows, you’ll also need the devkit installed).

Support

If you have a desired use case that’s not covered, let me know and I might well be able to code it up for you and add it. ex: currently it uses longs internally instead of ints—if you want ints or strings added, let me know. if you want it to remember insertion order, I could do that, too, or native "store away" strings/bignums, whatever. Could also add vectors, vector(pairs), priority queues, floats, native bignums, other more complex types, if anybody wants me to. This is meant to be one more tool in the rubyists toolbelt when trying to optimize speed-wise, and plans to expand to more types, but at least with this release it has a #each method. Could add #sum methods, etc. for the numeric types, for instance. If you want to see the code/hack on it, run extconf.rb within the ext directory, to create the code it actually uses (from a template). NArray gem : provides "native" type arrays (and X-Dimensional arrays—all in native memory, so also saves memory as this gem does).

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