Constructing arrays of structs

[Renato]

On Tuesday, 23 January 2024 at 18:15:29 UTC, Stephen Tashiro 
wrote:
> If the constructor of a class needs to create an array of 
> structs whose dimensions are inputs, what's the syntax for 
> doing this?
>
> For a non-example, the following program errors in main() 
> because in t.array[][] "index [0] is out of bounds".
>
>
> import std.stdio;
>
>     struct Point
>     {
>      uint x;
>      uint y;
>      void printInfo()
>      {
>         printf("(%d $d )",x,y);
>      }
>     }
>
>
>     class testClass
>     {
>       uint dimension;
>       Point[][] array;
>
>       this(uint the_dimension)
>       {
>         dimension = the_dimension;
>         auto array = new Point[][](the_dimension,the_dimension);
>         for(uint i = 0; i < dimension; i++)
>         {
>            for(uint j = 0; j < dimension; j++)
>            {
>               array[i][j].x = i;
>               array[i][j].y = j;
>            }
>         }
>       }
>     }
>
>     void main()
>     {
>        auto t = new testClass(5);
>
>        for(uint i = 0; i < t.dimension; i++)
>        {
>           for(uint j = 0; j < t.dimension; j++)
>           {
>             printf("(%d %d)",t.array[i][j].x, t.array[i][j].y);
>              //t.array[i][j].printInfo();
>           }
>
>        }
>
>     }

This works , your mistake was to not actually assign the array to 
the class' field!

Change this line:

```d
auto array = new Point[][](the_dimension,the_dimension);
```

To this:

```d
this.array = new Point[][](the_dimension,the_dimension);
```