How to pass arrays by reference in C++ Winforms

Question

Friends,

I have a method to resize a two-dimensional array in C#. I'm trying to transform this method to C++ Winforms.

I've tried several times but I'm not succeeding. Follow the method and method call in C#

At the beginning of the program, I define a matrix with 1 line and 6 columns like string.

I call a method that reads a database and populates a dataset. From there, I call the method passing the array name by reference, the number of rows, and the number of columns.

As record insertions occur, I need to resize the array. At that time I call the method passing the original matrix called todoagenda;

I do this with two more matrices. I call the same method but passing different matrices.

        void ResizeArray<T>(ref T[,] original, int x, int y)
        {
            T[,] newArray = new T[x, y];
            int minX = Math.Min(original.GetLength(0), newArray.GetLength(0));
            int minY = Math.Min(original.GetLength(1), newArray.GetLength(1));

            for (int i = 0; i < minY; ++i)
                Array.Copy(original, i * original.GetLength(0), newArray, i * newArray.GetLength(0), minX);

            original = newArray;
        }

The call is:

ResizeArray<String>(ref todaagenda, TotReg, 7); // resize the array to the new size

Answer 1

Try this:

generic<typename T>
void ResizeArray( array<T, 2>^% original, int x, int y )
{
    array<T, 2>^ newArray = gcnew array<T, 2>( x, y );

    int minX = Math::Min( original->GetLength( 0 ), newArray->GetLength( 0 ) );
    int minY = Math::Min( original->GetLength( 1 ), newArray->GetLength( 1 ) );

    for( int i = 0; i < minY; ++i )
    {
        Array::Copy( original, i * original->GetLength( 0 ), newArray, i * newArray->GetLength( 0 ), minX );
    }

    original = newArray;
}

Sample usage:

array<String^, 2>^ matrix1 = . . .
ResizeArray( matrix1, 10, 3 );

Answer 2

Hi friend Viorel.

Where do I put the line generic<typename T>.

I think only that line is missing, because the method is all underlined with error.