Trying to populate 2d array with struct. builds fine, error on run

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1

Hello! I’m new to Zig. Trying to have fun with raylib.
My code builds fine, why does it fail on run?

const Cell = struct {
    cell: Celltype,
    color: rl.Color,
    velocity: f32,
    density: f32,
    alive: bool,
    changed: bool,
};

const Grid = struct {
    list2d: [screenWidth][screenHeight]Cell,

    pub fn init_grid() Grid {
        return Grid{
            .list2d = [_][screenHeight]Cell{[_]Cell{.{
                .cell = Celltype.EMPTY,
                .color = rl.Color.black,
                .velocity = 0.0,
                .density = 0.0,
                .alive = false,
                .changed = false,
            }} ** screenHeight} ** screenWidth,
        };
    }
};

in main function:

const grid = Grid.init_grid();

Build Summary: 4/6 steps succeeded; 1 failed (disable with --summary none)
run transitive failure
└─ run pixels failure
error: the following build command failed with exit code 1:

2

Isn’t this just stackoverflow? Just because you can initialize statically, does not mean it’s a good idea.

3 Likes
3

Hello @vruks
Welcome to ziggit :slight_smile:

The simplest way to run a program is by entering the path of the program in the command line. After building, the executable is located at zig-out/bin. The following command runs the program pixels:

> zig-out/bin/pixels

Add the following code to display, when compiling, the size–in bytes–of the Grid.

comptime {
    @compileLog(@sizeOf(Grid));
}

If the size of Grid is bigger than 16MiB then it is a stack overflow.

2 Likes
4

Oh, thank you so much! :slight_smile:

1 Like
5

You can instead allocate the 2d array on the heap:

1 Like