Vector of references to template functions

Question

I have many functions defined like so :

template<class T>
std::tuple<Matrix<T>, Matrix<T>, Matrix<T>> gaussSeidel(Matrix<T> const& A, Matrix<T> const& b, long double precision) {
    ...
}

Now, I want to hold a reference to them all in a templated vector variable, that I try to declare like so :

template<typename T>
std::vector<std::tuple<Matrix<T>, Matrix<T>, Matrix<T>> (&) (Matrix<T>, Matrix<T>, T)> functs {gaussSeidel<T>, jacobi<T>, richardson<T>, sor<T>, gmres<T>};

It throws many C2528 errors at instanciation ( decltype(auto) functs<long double> ) when compiling in Visual Studio, emerging all from the allocator. Where am I going wrong ?

Answer 1

From what I know you need a vector of pointers to functions not references to functions. You should replace the (&) with (*)

template<typename T>
std::vector<std::tuple<Matrix<T>, Matrix<T>, Matrix<T>> (*)(Matrix<T> const&, Matrix<T> const&, long double)> functs {gaussSeidel<T>, jacobi<T>, richardson<T>, sor<T>, gmres<T>};