Using pair as key for hash_map under Visual Studio
c++, hashmap, std-pair
Solution
You have to write your own `hash_compare` - function for the object you're using as key!
In your case is it `std::pair<int,int>`
look at this post - maybe you get a better idea implementing your own comparator!
Problem
Try to use pair as key value for hash_map under Visual Studio 2010. Could not compile it. ``` int _tmain(int argc, _TCHAR* argv[]) { hash_map <pair<int, int>, int> months; months[pair<int, int>(2,3)] = 1; int d; cin >> d; return 0; } ``` got error message: Error 1 error C2440: 'type cast' : cannot convert from 'const std::pair<_Ty1,_Ty2>' to 'size_t' c:\program files\microsoft visual studio 10.0\vc\include\xhash 34 1 testApplication1 I know it probably due to `hash_map` doesn't provide a specialization for `pair`. Any easy way to fix it?