ForwardEulerSolver(ODEInterface& anODESystem, const Vector& initialState,
const double initialTime, const double finalTime, const double stepSize,
Vector (*pFunction)(double time, Vector u), const std::string outputFileName
= "output.dat", const int saveGap = 1, const int printGap = 1);

Vector FunctionToSolve(double time, Vector U)
{
    Vector Output(1);
    Output[0] = 1/(1 + pow(time,2));

    return Output;
}

Vector  (*pfunction)(double, Vector);
pfunction = &FunctionToSolve;

ForwardEulerSolver* EulerSystem(*pODESystem, *initialVector, 0, 10, 0.01, *pfunction);

error: cannot convert 'Vector (*)(double, Vector)' to 'ForwardEulerSolver*' in initialization

warning: right operand of comma operator has no effect [-Wunused-value]

warning: value computed is not used [-Wunused-value]

error: expression list treated as compound expression in initializer [-fpermissive]