Overloading insertion/extraction

[ciphermagi]

I am attempting to overload the stream operators for my class. I have the following code:

friend ostream& operator<<(ostream& ostr, const Stat& stat);

Which results in the following errors:

unable to resolve identifier ostream

I'm almost positive it's a header file I need, but I haven't been able to figure out which one. Any help would be appreciated.

[ciphermagi]

Nevermind...I feel retarded.

friend std::ostream& operator<<(std::ostream& ostr, const Stat& stat);

Problem solved....