Implicit conversion error - why is this code trying to convert a 'World' to an 'int'?

Question

using System.Collections; using System.Collections.Generic; using UnityEngine; public class World { Tile[,] tiles; int width; int height; public World (int width = 200, int height = 200) { this.width = width; this.height = height; tiles = new Tile[width, height]; for (int x = 0; x < width; x++) { for (int y = 0; y < height; y++) { tiles[x, y] = new Tile[this, x, y]; } } } public Tile GetTileAt(int x, int y) { if (x > width || x < 0 || y > height || y < 0) { Debug.LogError ("Tile (" + x + ", " + y + ") is out of range"); return null; } return tiles [x, y]; } }

anyone see anything wrong with this code because on line 18 of my code i get this error "cannot implicitly convert type 'World' to 'int' and i don't know what is going wrong.

DMGregory · Accepted Answer · 2017-03-24 17:14:02Z

Is it safe to presume this line is the culprit?

tiles[x, y] = new Tile[this, x, y];

(It never hurts to annotate your code with a comment like \\ This line generates the following error... to ensure it's clear for people trying to help)

It looks like you're trying to call a constructor for the Tile class, passing this world as the first argument. But instead of using round parentheses ( ) for a function call, you've used the square brackets [ ] of an array index or size declaration.

So, this says "Make a new 3-dimensional array of tiles, where the first dimension's length is the integer this" ...but this isn't an integer, this is a World!

Thus the compiler throws up its hands and says "fix this - you've asked me to do something nonsensical here" ;)

yeah thats the line thats throwing me a error, so are you saying that i should change it from [] to ()? — Shaow Wolf
– Shaow Wolf, Commented Mar 24, 2017 at 17:23
Yep! new SomeType[...] means "I'm creating a new array with the following dimensions" while new SomeType(...) means I'm creating a new object/struct with the following constructor arguments" — DMGregory
– DMGregory ♦, Commented Mar 24, 2017 at 17:26

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