Re: Returning a template depending on arguments

Noah Roberts <>
Sun, 28 Aug 2011 10:49:05 -0700 (PDT)
On Aug 28, 7:38 am, daniele lugli <> wrote:

Dear all,
this class:

template<int m, int n>
class SmallMatrix
        typedef double myData [m] [n];
        myData M;

        SmallMatrix () {
                for (int i = 0; i < m; i++) {
                        for (int j = 0; j < n; =

j++) {

                                M[i][j] =

= 0.;

        virtual ~SmallMatrix () {}
        operator myData & () {
                return M;
        operator const myData & () const {
                return M;


This entire class of yours can be replaced by this single line of

That's right, a noop.

Now I'll use it:

double matrix0[10][5] = {};

Your class offers nothing over this implementation. The encapsulation
benefit you'd normally get from implementing a matrix class is
entirely destroyed by your conversion operator, an obviously misjudged
attempt to force [][] syntax into the equation. Quite the contrary in
fact, your class provides for some interesting avenues for unexpected

Reconsider your conversion operator and attempt to gain [][] syntax.

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