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Asked: 2026-06-07T11:20:34+00:00

I have a multimap<key_type,value_type> and I would like to know if a particular key

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I have a multimap<key_type,value_type> and I would like to know if a particular key appears in the map at most one time.

I know I can call multimap.equal_range(key) to find an iterator to the start and end of the range containing key but I would like to know if there is only one element between the range.first and range.second.

Is there a better way than incrementing the range.first value to see if it is equal to range.end? Since multimap::iterator is bidirectional it’s not a huge deal to undo the increment but it seems sloppy to do that.

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1 Answer

  1. Editorial Team

    Could you check if the std::multimap::count(key) == 1?

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