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Simple Map Question

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Join Date: Oct 2007

Posts: 58

Reputation: ff4930 is an unknown quantity at this point

Solved Threads: 2

ff4930

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Junior Poster in Training

Simple Map Question

Jun 24th, 2008

Hello everyone,

I am new to maps and I have a simple question.

I have a map that stores a string as key and the data I want a map<int, int>

so my syntax is

map<string, map<int, int> test;

What would be the syntax to insert say "hello" and say 3,3?

test.insert( make_pair("hello", ???

Im stuck here.

Also, how would I display the contents?
map<string, map<int, int> >::iterator iter;
iter = test.begin();

cout << iter->first << endl;
cout << (int)iter->second->first;?????

Thanks for your help.

Last edited by ff4930; Jun 24th, 2008 at 11:49 am.

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Join Date: Sep 2004

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Narue

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Code Goddess

Re: Simple Map Question

Jun 24th, 2008

>What would be the syntax to insert say "hello" and say 3,3?

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
test.insert ( make_pair ( "hello",  map<int, int>() ) );
test["hello"].insert ( make_pair ( 3, 3 ) );
test.insert ( make_pair ( "hello",  map<int, int>() ) );
test["hello"].insert ( make_pair ( 3, 3 ) );

Don't forget that you need to create a new map for the second half of the pair.

>Also, how would I display the contents?

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
map<string, map<int, int> >::iterator iter = test.begin();
 
cout<< iter->first <<'\n';
cout<< iter->second[3] <<'\n';
map<string, map<int, int> >::iterator iter = test.begin();

cout<< iter->first <<'\n';
cout<< iter->second[3] <<'\n';

Once again, remember that the second half of the pair is a completely separate map. iter->second gives you the map object, not an iterator.