map<string, map<string, int>>

[jhirshon]

Can anyone show me how to use a map<string, map<string, int>>?

The declaration of the above data structure works, and I think that I can make some entries, but I'm unable to retrieve the entries.

This is how I'm declaring an iterator: map<string, map<string, int> >::iterator itr;.

Thanks,
Jordon

[phiefer3]

Can anyone show me how to use a map<string, map<string, int>>?

The declaration of the above data structure works, and I think that I can make some entries, but I'm unable to retrieve the entries.

This is how I'm declaring an iterator: map<string, map<string, int> >::iterator itr;.

Thanks,
Jordon

I'm not 100%, but I believe that iterator will only let you step through the outer map, that contains more maps. I assume you want access to the integers in the inner map, I'm not sure what the solution is, but I think that's your problem.

I guess it would be something like this:

map<string, map<string, int>> myMap;
map<string, map<string, int>>::iterator outerIter;
map<string, int>::iterator::innerIter;

outerIter = myMap.begin();
innerIter = outerIter->second.begin();

[weaknessforcats]

It looks like you have a map of maps.

In your code, itr will point to a map so you use itr-> to call a member function on that map.

To see an element of the second map, you need to find it by key:

map<string, map<string, int> > MyOuterMap;
map<string, int> MyInnerMap;
 
//Pretend elements arew added
pair<string, map<string, int> > p1(string("Hello"), MyInnerMap);
MyOuterMap.insert(p1);
map<string, map<string, int> >::iterator itr;
string keyouter("Hello");
string keyinner("world");
 
itr = MyOuterMap.find(keyouter);
if (itr == MyOuterMap.end())
{
         //not found
         return -1;
}
map<string, int>::iterator  inneritr;
inneritr = itr->second.find(keyinner);
if (inneritr == itr->second.end())
{
         //not found
         return -1;
}
cout << inneritr->second;
 

Try this.