2D array in C++?

Hi, having trouble getting 2D arrays working properly.

Something like this causes errors

int32[][] test = { { 1,1,1 }, {2,2,2} };

And something like this, I can’t figure out how to properly initialize

    TArray<TArray<int32>> test;

Also, the 2D array holds a HUGE amount of data.
How can I properly create a 2D array, initialized with a large amount of data? (Without needed a thousand test.Add()) The first example would be great since the data can just be added with commas, but unreal doesn’t like int32[][], so I can’t figure out the proper way to do it.



The first problem is that your braces are in the wrong place:

int32 test[][] = { {1, 2, 3}, {4, 5, 6} };

The second is that you need to specify the number of elements in each sub-array:

int32 test[][3] = { {1, 2, 3}, {4, 5, 6} };

I hope that helps.

I’d question why you want a “huge” amount of data to be compiled into the program binary and take up static memory space. You might want to consider using a Data Table:

Whoops, braces was just a typo when I wrote em here. Didn’t know I needed to specify the sub-array size though, thanks!

The data is actually a few decently sized 2D arrays from a Simplex Noise library that I’m porting over from c++. It’s just a list of raw pseudo-random numbers to help with the generation I suppose. The c++ version had it working with just int32 test[][], glad to know it’s an easy fix!

Thanks for the help :slight_smile: