How Can I Define a Column Vector Type Using C Templates?

C Template Typedef for Matrix Column Vector

In C , a common task is to create a column vector equivalent to a matrix with specific dimensions. For instance, a Vector class derived from a Matrix class would be desirable. Unfortunately, using the standard typedef mechanism for this purpose leads to compilation errors.

C 11 Solution: Alias Declarations

C 11 introduced alias declarations, a generalization of typedef, which allows for template specialization. The following code provides a solution:

template <size_t N>
using Vector = Matrix<N, 1>;

With this declaration, the type Vector<3> is equivalent to Matrix<3, 1>.

C 03 Workaround

In C 03, the workaround most similar to the alias declaration is to use a nested typedef:

template <size_t N>
struct Vector {
  typedef Matrix<N, 1> type;
};

In this case, Vector<3>::type is equivalent to Matrix<3, 1>.

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