What is the C++ equivalent of python collections.Counter?

Question

The python collections.Counter object keeps track of the counts of objects.

>> from collections import Counter
>> myC = Counter()
>> myC.update("cat")
>> myC.update("cat")
>> myC["dogs"] = 8
>> myC["lizards"] = 0
>> print(myC)
{"cat": 2, "dogs": 8, "lizards": 0}

Is there an analogous C++ object where I can easily keep track of the occurrence counts of a type? Maybe a map to string? Keep in mind that the above is just an example, and in C++ this would generalize to other types to count.

Answer 1

You could use an std::map like:

#include <iostream>
#include <map>

int main()
{
    std::map<std::string,int> counter;
    counter["dog"] = 8;
    counter["cat"]++;
    counter["cat"]++;
    counter["1"] = 0;

    for (auto pair : counter) {
        cout << pair.first << ":" << pair.second << std::endl;
    }
}

Output:

1:0
cat:2
dog:8