How Can I Create a Vector Type Alias from a Matrix Template in C ?

Creating a Typedef for a Matrix-like Vector Using Template Aliases

Consider the following class template:

template<size_t N, size_t M>
class Matrix {
    // ....
};

The goal is to define a typedef which creates a Vector (column vector) that is equivalent to a Matrix with sizes N and 1. Initially, the attempt was made using a typedef:

typedef Matrix<N,1> Vector<N>;

However, this resulted in a compile error. A similar but not identical solution was achieved using class inheritance:

template <size_t N>
class Vector: public Matrix<N,1>
{ };

To find a more suitable solution, we turn to alias declarations introduced in C 11:

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

This allows for the creation of a type alias Vector that is equivalent to Matrix.

In C 03, a similar approximation can be achieved using a struct with a nested typedef:

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

Here, the type Vector::type is equivalent to Matrix.

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