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Tiffie
Guest
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 Posted: Sun Jul 23, 2006 1:39 pm Post subject: how to traverse a map |
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hi guys,
imagine i have this map here:
std::map<String,std::map<String,String> >data;
data["bert"]["type"] = "student";
data["jens"]["type"] = "student";
data["mike"]["type"] = "teacher";
data["kim"]["type"] = "teacher";
now i like to traverse the map and show me all the names (bert, jens, ....)
how can i do this in a loop?
Tiffie |
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Muzaffar Mahkamov
Guest
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| Posted: Sun Jul 23, 2006 5:33 pm Post subject: Re: how to traverse a map |
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Tiffie wrote:
| Quote: | hi guys,
imagine i have this map here:
std::map<String,std::map<String,String> >data;
data["bert"]["type"] = "student";
data["jens"]["type"] = "student";
data["mike"]["type"] = "teacher";
data["kim"]["type"] = "teacher";
now i like to traverse the map and show me all the names (bert, jens, ....)
how can i do this in a loop?
Tiffie
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You should use iterators for map<>. Iter->first will contain the key
element, Iter->second will contain the mapped element:
typedef std::map<String, std::map<String,String> >::iterator
student_iterator_t;
typedef std::map<String,std::map<String,String> > student_list_t;
student_list_t data;
student_iterator_t it = data.begin();
student_iterator_t end = data.end();
while(it != end)
{
std::cout << it->first << std::endl;
++it;
} |
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