how to implement c++ table lookup?

[sdcode]

[][] should word automatically with a map< int, map<int,int> >.....

Although, there is one thing to be careful of. Using [] on a map *will* add that key to the map if it isn't there already (with a default-constructed value, in this case 0).

If you want to be able to test whether or not a pair is in the map yet, you'll have to use find() instead.

thanks for the warning.

my code looks like this:

 
int GetValueAt(int x,int y)
{
return table[x][y]; 
}

If I try some random x and y where table[x][y] doesn't exist, it will make one? And then return 0 ?