How to make a function inside a class return a vector?

I have a class and I want one of the class functions to take in a vector and return a different vector. I tried something like this but I get errors at the function declaration and definition saying that they don't match.

error messages:

setsP4.cpp:286:26: error: prototype for ‘const std::vector<int>&  SetParallel::checkElements(std::vector<double>&)’ does not match any in class ‘SetParallel’
 std::vector<int> const & SetParallel::checkElements(std::vector<double> & vec
                          ^
setsP4.cpp:68:30: error: candidate is: const std::vector<int>& SetParallel::checkElements(const std::vector<double>&)
     std::vector<int> const & checkElements(const std::vector<double> & );

example:

class myClass{  
public:  
    std::vector<int> myFunction(const std::vector<double> & );  
};  

std::vector<int> myClass::myFunction(const std::vector<double> & myVect){  
    std::vector<int> results;  
    //do stuff with results;  
    return results;  
}