C++11 hash containers

Storyyeller · 2011-12-02T22:23:58

So how does one use the new unordered_set and unordered_map? I haven't been able to find a single code example of these containers being used with a user defined type. And it isn't clear how you extend std::hash, or if this is even what you're supposed to do.

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Started by Storyyeller December 02, 2011 05:31 PM

11 comments, last by Storyyeller 12 years, 4 months ago

Storyyeller

215

Author

December 02, 2011 08:50 PM

Well I was hoping for a method that wouldn't require splitting up my namespace and repeating the name several times, but from the responses it looks like there's no way around it. Oh well.

I trust exceptions about as far as I can throw them.

Washu

7,836

December 02, 2011 10:20 PM

Also, returning 0 for your hash is, generally speaking, a bad idea

I realize its just sample code, but even a simple xor is better than 0.

In time the project grows, the ignorance of its devs it shows, with many a convoluted function, it plunges into deep compunction, the price of failure is high, Washu's mirth is nigh.

Storyyeller

215

Author

December 02, 2011 10:23 PM

Yeah, that's obviously not my real hash function.

I trust exceptions about as far as I can throw them.

C++11 hash containers

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C++11 hash containers

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