/////////////////////////////////////////////////////////////////////
/// \brief Unroll the expression given.
/////////////////////////////////////////////////////////////////////
template ExprUnroll(alias Code, alias Size, alias Op="") {
    enum t = replace(Code, "%", "%1$d");
    enum ExprUnroll = iota(Size).map!(i => format(t, i)).join(Op);
}


/////////////////////////////////////////////////////////////////////
/// \brief Define a mathematic vector.
///
/// \author Wolftein <wolftein@ghrum.org>
/////////////////////////////////////////////////////////////////////
public struct Vector(T, size_t Dimension) {

    /// \brief The array that contain the components of the vector.
    private T component[Dimension];

    /// \brief The lenght of the vector.
    private immutable size_t size = Dimension;

    /////////////////////////////////////////////////////////////////////
    /// \brief
    ///
    /// \param[in] vector
    ///
    /// \return
    /////////////////////////////////////////////////////////////////////
    public Vector!(T, size) opAdd(auto ref Vector!(T, size) vector)
    in {
        assert(vector !is null, "Vector cannot be null");
        assert(vector.size() != size(), "Vector differ size");
    }
    body {
        mixin( ExprUnroll!("component[%] += vector.component[%]", Dimension));
    }
}