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Questions - unordered-set

std::unordered_set and alternative and overcomplicated ways of defining custom Hash and EqualKey

I am working with std::unordered_set of CustomKey objects and I am thinking about how to complicate my life. I already know the idiomatic ways of using custom Hash and EqualKey. For custom Hash it's p...
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vaeVictis

c++

c++11

hash

c++17

unordered-set

Votes: 0

Answers: 0

Why isn't std::hash specialized for containers?

I started looking into std::unordered_set today and quickly found that std::hash doesn't specialize for all types -- only for those types that are listed here, but I couldn't find the reasoning for wh...
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Pacopenguin

c++

hash

unordered-set

Votes: 0

Answers: 0

How set is different from unordered_set in c++?

I was solving a problem where I have to find the number of distinct numbers so I used unordered_set and insert the given elements in the set, then I printed the size of the set. #include <bits/std...
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Ayush Gupta

c++

set

unordered-set

Votes: 0

Answers: 0

Multimap with key as unordered set and value as integer pair - unable to call find member function

Consider code: #include <unordered_map> #include <unordered_set> #include <boost/functional/hash.hpp> typedef std::unordered_multimap<std::unordered_set<int>, std::pair<...
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Tryer

c++

boost

unordered-map

unordered-set

Votes: 0

Answers: 1

Latest Answer

Like others said, you're missing a hash implementation using a pretty inefficient key type I'd simplify on both accounts: Live On Compiler Explorer #include <boost/container/flat_set.hpp> #inc...
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sehe

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