Conway's Game of Life 👨‍💻 C++ Project

[@artyomkazakov9414]

Thank you man! I struggled with this thing for a long time and now this damn thing works

[@PunmasterSTP]

I think it’s amazing to see how widely Conway’s Game of Life has been shared. This was another great video, and thanks for posting it!

[@TheBuilder]

Glad you enjoyed it!

[@Bill-s6j2w]

what about it was "great"? It's repetitious, the provided algorithm is awful, no discussion of drawing to screen. there is no way that I would be pointing anyone to this resource as a learning tool.

[@PunmasterSTP]

@@Bill-s6j2w Maybe it’s not the best video ever, but I still enjoyed watching it and wanted to leave a comment.

[@omg_look_behind_you]

a quick bitwise test for cell life: alive = (cell | neighbors) == 3; because 0b00 | 0b11 == 0b11 0b01 | 0b11 == 0b11 0b01 | 0b10 == 0b11

[@TheBuilder]

Do you mind posting an example using these bitwise tests?

[@anonymousperson420]

Why copy a whole array instead of just swapping the addresses the function takes in? Wouldn’t that be faster and more efficient?

[@TrioGamesStudio]

Thank you so much, it works !

[@TheBuilder]

Glad it helped

[@naman7906]

Hey, I tried running your screen.h header file on the newest version of SDL2 in vs code. It shows SDL2/SDL.h header file not found in the directory even though it is present there included in the path and the SDL2 library works fine for the other project.

[@TheBuilder]

VS code is telling you that or the compiler?

[@naman7906]

@@TheBuilder Actually at the terminal. The VS code detects the library just fine

[@TheBuilder]

you need to configure your vs code to recognize your library file location

[@qwertywasd751]

what changes would I have to make if i wanted to check the edges like a torus?

[@TheBuilder]

if you want to wrap the picture to a torus, you'd just generate the texture then apply it to a torus model

[@Bill-s6j2w]

wow, what a super helpful response @@TheBuilder

[@anonymousperson420]

When working with cell addresses, use modulo. I.E. to get cell neighbor cell-1, use (cell+(width-1))%width, this wraps around by adding the width minus one then modulo. Going to the right is simpler (cell+1)%width. Then repeat for the other axis. This allows wrapping without overflow.

[@meeravali.kocherla]

Hey I need SDL2/SDL.h header file can you please share that link if possible?

[@TheBuilder]

check the official documentation

[@mohammedelgammal7211]

Great tutorial! Here is more efficient version without extra memory space SC O(1): void updateScreen(G &screen) { screen.update(); SDL_Delay(100); screen.input(); screen.clearpixels(); } int main() { G screen; int h = 640, w = 480; vector display(h, vector(w, 0)); for (vector &r : display) generate(r.begin(), r.end(), []() -> int { return rand() % 10 % 2; }); while (true) { for (int r = 0; r < h; r++) for (int c = 0; c < w; c++) { int ln = 0; for (int i = r - 1; i = w || (i == r && j == c)) continue; if (display[i][j] == 1 || display[i][j] == 3) ln++; } if (display[r][c] == 0 && ln == 3) display[r][c] = 2; if (display[r][c] == 1) { if (ln < 2 || ln > 3) display[r][c] = 3; screen.drawpixel(r, c); } } updateScreen(screen); for (int r = 0; r < h; r++) for (int c = 0; c < w; c++) { if (display[r][c] == 2) { display[r][c] = 1; screen.drawpixel(r, c); } if (display[r][c] == 3) display[r][c] = 0; } updateScreen(screen); } }

[@meeravali.kocherla]

where are you running this code?

[@TheBuilder]

at 17:15 through my terminal

[@meeravali.kocherla]

@@TheBuilder what editor you are using

[@TheBuilder]

@@meeravali.kocherla vim

[@AquaDragon6629]

Ok, so i don't know if im being really dumb, or if some super important stuff has been missed out.. but what is game? Every time i try to use game[][] it tells me "no operator "[]" matches these operands" And also, my two arrays for display and swap are both telling me "incomplete type is not allowed" and "local variable is not initialised". Any help?

[@TheBuilder]

make sure the function definition matches the one I have, also make sure you're compiling your code using the c++20 standard

[@AquaDragon6629]

@@TheBuilder So, my code is exactly the same as yours, and I've updated my compiler to c++20. But I'm still getting the same issues. I can't figure out the issue

[@Fidelity_Investments]

@@AquaDragon6629 Make sure you #include

[@Bill-s6j2w]

this is what happens when a "tutorial" is incomplete.

[@Bill-s6j2w]

why is it that all tutorials spend ages going over the same thing again and again when that thing is really not complicated to understand ... for example: don't test an item outside of the array's upper and lower bounds. Why say the same thing so many times: say it once ... we are testing this cell, which has these neighbours. That's all it takes, if anyone cannot understand that then they really should not be trying to code anything, let alone Conway's Game of Life. Also, what an awful "algorithm" for life testing You've spent ages going over the same thing multiple times, which really doesn't advance understanding: and yet the important part (drawing the game to the screen) you've just glossed over with "oh, if you need this it's in a repo somewhere, otherwise, well it's not too difficult" Do you think coding the Game of Life is difficult? so why TRY to teach that and not the part about writing to screen

[@TheBuilder]

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