How Can I Define a Vector Type as a Specialized Matrix in C Using Typedefs?

C Template Typedef: Creating a Vector as a Specialized Matrix

Defining a typedef to create a vector equivalent to a matrix with specified dimensions can be challenging. Let's explore a solution:

Consider a class template Matrix representing a matrix with dimensions N x M. We aim to define a typedef Vector that corresponds to a column vector with dimensions N x 1.

Using traditional typedef mechanisms like:

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

will result in a compilation error. Instead, C 11 introduces alias declarations that allow templates:

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

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

In C 03, an approximation was possible through nested typedefs:

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

Here, Vector<3>::type would be equivalent to Matrix<3, 1>. This approach, while not as concise as the C 11 syntax, provides a viable alternative in earlier versions of C .

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