std::unordered_map, can you access the elements in a bucket with its bucket number? [duplicate]

问题

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C++11 get all items of one bucket in a unordered_map (1 answer)

Closed 5 years ago.

for std::unordered_map, can you access the elements in some bucket i if its bucket_size is not zero?

回答1:

The answer is to use std::unordered_map::begin(bucket_num) or std::unordered_map::cbegin(bucket_num) to get the iterator pointing to the the first element to that bucket and iterate to the end of the bucket std::unordered_map::end(bucket_num)

for ( auto it = u_map.begin(bucket_num); it!= u_map.end(bucket_num); ++it)
{
   cout<<it->first<<", "<<it->second<<endl;
} 

来源：https://stackoverflow.com/questions/32043034/stdunordered-map-can-you-access-the-elements-in-a-bucket-with-its-bucket-numb