I have multimap<key_type,value_type> , and I would like to know if a particular key will be displayed on the map no more than once.
I know that I can call multimap.equal_range(key) to find an iterator for the beginning and end of the range containing key , but I would like to know if there is only one element between range.first and range.second .
Is there a better way than incrementing the value of range.first to see if it is equal to range.end ? Since multimap::iterator is bidirectional, this is not a huge deal to undo the increment, but it seems messy for that.
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