| Vir Campestris <vir.campestris@invalid.invalid>: Aug 16 09:44PM +0100 On 14/08/2015 10:57, Paul wrote: > example[0] = 3; > If we apply the desired function to example, we would get 2 because there are two distinct values -- 3 and 7. > The way I know how to do this simply is to insert or copy into a std::set and apply size() to the set but that seems inefficient and inelegant. OK, I'm confused. unordered_map contains values whose keys are unique. So surelt the answer to the number of unique values is ... size()? If it was a multimap of some sort the question would be different, and I suspect making a set of the keys would be the fastest answer. Andy |
| Nobody <nobody@nowhere.invalid>: Aug 16 10:13PM +0100 On Sun, 16 Aug 2015 21:44:10 +0100, Vir Campestris wrote: > OK, I'm confused. unordered_map contains values whose keys are unique. > So surelt the answer to the number of unique values is ... size()? No, that's the number of unique *keys*. The OP is asking for the number of unique *values*. Nothing about the question is specific to unordered_map; it could be any container. |
| Jorgen Grahn <grahn+nntp@snipabacken.se>: Aug 16 10:15PM On Sun, 2015-08-16, Nobody wrote: > unique *values*. > Nothing about the question is specific to unordered_map; it could be any > container. To be fair, the std::unordered_map is, the value_type is the (key, value) pair. What we tend to think of[0] as the value is what the library calls the data_type. /Jorgen [0] Because that's the terminology outside C++. -- // Jorgen Grahn <grahn@ Oo o. . . \X/ snipabacken.se> O o . |
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