std::map problems | GameDev.net

Original Post

Apr 7, 2005 at 6:27 PM

I need to get the key value for a std::map::iterator. How is this done? std::map<std::string,int> Age; Age["John"] = 31; Age["Jane"] = 20; Age["Someone else"] = 101; .... Later std::map<std::string, int>::iterator Iter = Age.begin(); Now how can you get the key value of Iter?

Stephen R

Apr 7, 2005 at 6:33 PM

Iter->first is the key and Iter->second is the value.

fozed

Author

fozed

Apr 7, 2005 at 6:51 PM

so Iter->first points to a std::string and Iter->second points to an int?

Stephen R

Apr 7, 2005 at 6:53 PM

Yup

Prototype

402

Prototype

Apr 7, 2005 at 7:03 PM

Also consider that iter points to a std::pair, which basically is the templated struct that holds first and second. This can be used in several functions, for example:

std::map<std::string, int> _map;std::pair<std::string, int> _pair;_pair.first = "foo";_pair.second = 42;_map.insert(_pair);

Hope that clears it up.

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