CODEWITHSUNDEEP
c++dictionary
Tom Lilletveit
Tom Lilletveit

Reputation: 2002

Retrieving key of a Map (Stanford C++ Libraries)

I am using the Map type from the Stanford libraries. And I can easily get values, by passing it .get(key) But it occurred to me that it would be beneficial if I could retrieve it´s keys as-well. Is there a way of doing this?

According to it´s doc at: http://www.stanford.edu/class/cs106b/materials/cppdoc/Map-class.html it does not have such functions. But is there another way of doing it?

Maybe using an iterator: Map <string, int>::iterator ?

Upvotes: 0

Views: 546

Answers (2)

Robᵩ
Robᵩ

Reputation: 168876

Yes, there is. Try foreach:

As a simplification when iterating over maps, the foreach macro iterates through the keys rather than the key/value pairs.

Upvotes: 2

srbhkmr
srbhkmr

Reputation: 2104

Your map.h includes a comment:

Additional Map operations
 - Iteration using the range-based for statement, standard STL iterators, and the mapping function mapAll

so, I guess you could try iterating with iterator:

Map<string, int> :: iterator it;
for(it = m.begin(); it != m.end(); ++it){ // Here m is your Map variable.
       string key = it->first;
       //... do something
}

Upvotes: 1

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