Question

I have a pair and a map declared as such

typedef pair<string,string> Key;
typedef map< Key, double> Map;

i insert objects into them via a for loop as such

Key p (string1, string2 );
pair_map.insert(make_pair( p, double1 ) );

how can i find elements in the map? I am having trouble setting up the iterator with find.

Suppose I’m using it = pair_map.find(make_pair(string1,string2));

I’ve tried declaring pair_map<Key, double>::iterator it; or map<Key, double>::iterator it; but neither are working for me. How can i fix this?

the errors i get are all long invalid cast errors because of the typedef’s

Answer 1

Map::iterator it = pair_map.find(make_pair(string1, string2));

And of course you can use

auto it = ...;

or

decltype(pair_map.begin()) it = ...;

in C++11.