How to insert a array into unordered set?

Question

I want to create a tuple/array like (0,1,2), (3,4,5). I want to store it into an unordered_set. But unordered_set didn't offer such a hash function. Can anyone tell me how can I do this?

I have read thes answer: C++ how to insert array into hash set? but I don't want to add any extra code like hash function.

There is no alternative but to add a hash function. Because std libraries don't provide the hash function for tuple and arrays. You can create your own templatized hash class which can be reused. — Mohit Jain
– Mohit Jain, Commented May 20, 2016 at 10:44

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

I want to store [array] into an unordered_set

unordered_set didn't offer such a hash function

I don't want to add any extra code like hash function.

Tough luck. A hash function is mandatory. Since it's not provided by the standard library, it must be provided by you. The answer in the question you linked shows how to write a hash function for std::array.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered May 20, 2016 at 10:45

eerorika

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