Retrieving type of Opencv Mat_<T> at compile time

Question

I need to access the element type T of an opencv matrix Mat_<\\T> at compile time; Is there any way to do it? I am trying to achieve the following:

template <typename T>
void foo(const T& mat) {

  // T::type* ptr = (T::type*)mat.data;
}

foo(Mat_<float>::ones(5,5));

The following declaration is not an option:

template <typename T>
void foo(const Mat_<T>& mat);

Answer 1

It looks like there is a typedef called value_type that does what you want.

template <typename T>
void foo(const T& mat) {
    T::value_type* ptr = ...;
}