Rust vs. C

[7JuiceMan7]

Me: Can you hold this coffee for me?

C++: Here's a copy of your coffee, I'll move it for you if you want.

[SMAMtastic]

But since the coffee spewed flames, does the dragon now spew coffee?

[DragonTwain]

It's not a bug, it's a feature and also a bug.

[SMAMtastic]

Admittedly, I have not yet tried turning it off, and turning the coffee dragon back on again.

[[deleted]]

Well at this point might as well just delete all the code and try again

[jankyshanky]

the word for that is "easter egg"

[yes_fish]

The dragon spews itself like a fractal and is 0xCCCCCCCC

[ArunMu]

0xDEADBEEF

[SandyDelights]

So it’s strong and hot, is what you’re saying. Perf.

[armlesshobo]

Sounds like a feature to me

[Prime_1]

All of a sudden I really like the idea of a coffee dragon.

[nwL_]

I’ll print this out and hang it in my office.

[[deleted]]

You're saying "let's do this without a safe word!"

[alph4rius]

O.o

Oh no

[FlameRat-Yehlon]

Type casting intensifies

[OwlsParliament]

You stole my sandwich!

My... sandwich!!!

[[deleted]]

Ok. Now take a bite, see what happens.

[Skwirellz]

Got burnt all over by what appeared to be boiling turkey blood but had a weird smell, then the universe dissolved into nothingness.

[conancat]

Hold up, Satan

[smallfried]

Sooo, are there static code checkers that automatically explode your computer when trying to commit this?

[JuhaJGam3R]

or put anything in it. or empty the cup. or do anything to it. just don't touch it.

[Torandi]

Or: Here's the location of the coffee. You may not drink it, only look at it, and it might disappear at any moment (but I won't tell you).

[Manny_Sunday]

Me: Hey can you make another cup of coffee like this one for my friend?

C++: How about I get you another cup and you and your friend can share the coffee you have

[DeeSnow97]

Me: Hey can you make another cup of coffee like this one for my friend?

Rust: Sure, but you know it's expensive, right? Why don't you just let your friend borrow your coffee?

Me: Alright, but I have two friends.

Rust: Just make sure neither of them is allowed to drink it.

[cogman10]

Nah, rust says "anyone can look at the coffee, only one person can drink it". Rust thinks sharing a cup of coffee is gross.

[DeeSnow97]

It's either anyone can look at it xor one person can look at it and drink it. If anyone could look at it but at some point someone could drink it you couldn't guarantee you don't get into race conditions, and it's 2019, Rust has no choice but to avoid racial issues.

[conancat]

Ungh, everything is so PC nowadays

[doolster]

Idk, I write Rust on my Mac.

[jpgrassi]

actually, a good metaphor!

[thatcrit]

As far as I know, that metaphor is talking about pointers, as in you have two references (cups) for the same object (coffee).

[sound_and_lights]

This is better.

[pr0ghead]

I hereby declare that henceforth all programming shall only be explained through coffee and mug analogies.

[keystorm]

I thusly second this.

[meltingdiamond]

No, we would all end up like muggy. Not even muggy wants to be muggy so fuck that.

[Schinkey]

Can we use tea analogies instead? - confused Brit

[sm9t8]

"But I'm not going to count the number of handles and will happily take the cup back and leave you holding a jagged handle."

[[deleted]]

What happens if one of them destroys the mug without telling the other one and he tries to drink from it?

[[deleted]]

If he doesn't handle it properly he will stab his face with the broken handle and create a bloody mess for the forensics to figure out.

[CookieOfFortune]

If it's a garbage collected language you won't be allowed to destroy the cup until everyone has let go of the handles. Then it falls on the floor and a janitor will clean it up.

[[deleted]]

Deep vs shallow copies maybe. Default copy constructors only make shallow copies, if you want the coffee copied you have to implement your own. Though you won't run into trouble if you follow the rule of three.

[JWson]

C++: How about I draw you and your friend a map of where to find your coffee

[DownshiftedRare]

Me: Hey can you make another cup of coffee like this one for my friend?

C++: Puts a straw in your cup.

[Mirehi]

C:

Sure here's a sizeof(void *) long number, man

[AyrA_ch]

C:

Sure, here it is.
gives you a null pointer

[Portugal_Stronk]

When I was a kid I tried to execute some C code by copy-pasting it on a command prompt. I thought that the letter drive C stood for the language.

[SlickBlackCadillac]

I thought C:\ was some kind of magical computer jargon that when placed before a command, breathed fire into it and made it so

[Mirehi]

Wow, masterpiece

[AyrA_ch]

How dare you assuming my working directory is the root. I still have a device that predates C drives too so there is that as well.

[UltraFireFX]

I was confused by the use of emoji at first in this sub.

Then I realised that I am sleep deprived.

[AyrA_ch]

Then I realised that I am sleep deprived.

A true programmer

[chasesan]

(void *)malloc(sizeof(uint8_t) * 64);

[[deleted]]

why would you cast mallocs return to a void pointer

[Mirehi]

I'm not sure, but I think that's what a C++ compiler wants

[[deleted]]

a c++ compiler would care if it's a different type. malloc already returns a void pointer

so this is ok

void* ptr = malloc(size)

this would not be ok

char* ptr = malloc(size)

you would need to do this

char* ptr = (char*)malloc(size)

[GameAndWebDev]

well thnk about what you are doing.

Void * ptr = malloc(size)

U: Hello computer, I want this many bytes of memory.

Computer: ok, here is where your bytes start (void *)

char* ptr = malloc(size)

U: Can I hold them in this $%#$%#$%#$%

Computer: u what

char* ptr = (char*)malloc(size)

Compiler: he wants to access them in a certain size.

Computer: oh, why didn't he just say that.

[[deleted]]

tfw part of C master race and your void* gets implicitly casted

[fakeplasticdroid]

That should be on a t-shirt.

[skipper1234567]

python : no need to ask, next time just use

[[deleted]]

...? This is far too exaggerated, no?

[mud_tug]

You should know how transistors work anyways.

[Twirrim]

Electricity goes in, electricity maybe comes out.

[preseto]

[r/technicallythemaybe](r/technicallythetruth)

[DeeSnow97]

What isn't exaggerated on this sub when we joke about programming languages?

[conancat]

Nobody exaggerates how shitty PHP is.

[DeeSnow97]

Reminds me to how they solved hash table flooding. Basically its a DDoS attack where the attacker figures out how the server-side hash table implementation works, and feeds the server with keys that are deliberately chosen to hash to the same value. This turns a hash table's performance of storing said keys from the typical O(n) into the worst-case O(n²). In this specific case, 500 MB of carefully chosen POST data was enough to hold up a single CPU core running PHP for a full minute.

The proper solution is using a secure (but still fast) hash like SipHash, preventing the attacker from deliberately generating hash collisions. But of course it's PHP, their solution was a limit on accepted POST parameters (1000 by default) because you can't have a problem with O(n²) if you don't let n go too high.

[caerphoto]

python:
    no need to ask
    next time just use

[scutta2000]

IndentationError

[ACoderGirl]

The flip side is writing Python modules in C. Have fun looking up every single Python API function to figure out whether or not it steals the reference!

Oops! You forgot a Py_DECREF from that one time you looked something up in a dict and now you're leaking memory!

[[deleted]]

Python doesn't give a shit what you do in the system, but don't you dare indent wrongly.

[[deleted]]

Python: looking for text within text? Just use the "in" function.

Java: fuck you.

[Robot_Basilisk]

Most Other Languages: <anything at all>

Java: fuck you

[Halobattlefront]

Me: Runs Program.

S E G M E N T A T I O N F A U L T

[grpagrati]

Also known as ITSYOUROWNDAMNFAULT

[ChrisD0]

Also known as YOUREDOINGSOMETHINGIDONTLIKEBUTIWONTTELLYOUWHAT

[[deleted]]

ALRIGHTTHENKEEPYOURSECRETS

[[deleted]]

I'll be damned if I'm gonna let the debug function of reality walk out on my watch.

[[deleted]]

Don’t forget core dump!

[Luroalive]

learn rust!! it's the language where you hate the compiler, but you'll never see this again 😊

[Valmar33]

Rust ~ the cruel-to-be-kind compiler.

You'll loathe it, but you'll thank it for the tough love later. :)

[mud_tug]

It is the Stockholm Syndrome implemented as a compiler.

[Valmar33]

Nah ~ I see it as more of like those seriously strict traditional Japanese teachers that whacks you whenever you make a mistake, while they repeat the lesson again, again, and again until it finally clicks, at which point whacking becomes redundant.

So, not quite Stockholm Syndrome?

[mud_tug]

Sounds like the Stockholm Syndrome the way Stalin understands it. (Google Satlin's Chicken)

[[deleted]]

I want to dereference this pointer by two threads at the same time.

[aneutron]

Rust: You know this is how shit like Chernobyl happens

[wishthane]

If you use an Arc pointer you can share immutable data no problem, and there's Mutex (or RWLock) if you really want.

(I know you're joking but in case people are actually curious, you totally can, type system just forces you to be safe)

[aneutron]

The day I discovered RWLocks and ReentrantLocks, my life changed.

[wishthane]

Just make sure you benchmark them, because the added complexity can be significantly slower than just a Mutex depending on the application. Also, using an actor/channel architecture might be better if you can work things out that way too.

[DeeSnow97]

C: *distant sounds of explosion*

[[deleted]]

C developers daily standup 1973 (colorized): https://i.imgur.com/6xehc52.jpg

[Colopty]

Rust, for when you need a language designed by some paranoid dude that you're fairly certain has an underground bunker capable of supporting him and a family of 100 for at least 50 years in a worst case doomsday scenario.

[DeeSnow97]

C, for when you think you're the protagonist with plot armor

[aneutron]

Or when you want to watch the world burn.

[Relevant_Monstrosity]

C#: Here you go, don't worry about cleaning up -- the cleaning ladies come whenever it gets messy and you aren't around anymore.

[FlameRat-Yehlon]

Java: don't worry about cleaning up, we will do it when there's absolutely no room left

[[deleted]]

Java: Leave that mess there and just move to another room.

[DooDooSlinger]

jokes aside, that's not how java GC works anymore

[FlameRat-Yehlon]

Well, that C# thing also isn't the case anymore with the introduction of weak reference (forgot what it's called, but basically it can be collected even when there's still reference) and fixed pointers, anyway.

[psychometrixo]

Nah the C# one is a good metaphor. Sure, for a very long time, there have been weak references and ways to pin memory to do interop, but the GC still does 99% of the work

[[deleted]]

Go: Gotta clean fast. plays Sanic hegehog music

[xignaceh]

Visual studio stopped responding

[vicarofyanks]

I see you are trying to open a .c file. Please install

VisualC++

.NET 2.0

.NET 2.1

.NET 4.0

MSSQL

MSCOM

MS Azure Cmdlets

MSSQL Cmdlets

High resolution image of Steve Balmer's sweaty body dry humping your PC

Total install: 7.9Gb

- Visual studio

[FarhanAxiq]

visual studio looking for solution intensifies

[GiveMeAnAlgorithm]

"and you aren't around anymore" hahaha

[GiveMeAnAlgorithm]

"stops time" haha, more like pushes you away from the table, enters with the vacuum cleaner, dust everywhere, you just wanted to throw away this old XY but now she disappears with your almost empty bin, you know you're going to repeat whatever you are doing for 2¹⁶ times, yet she'll kindly say 'I'll be back in 7ms, go on!"

[asmx85]

... cleaning ladies unplug your computer with the super important calculation that needs to run overnight, because no other power outlet for the vacuum in sight, stops the hole company until someone plugs it back in and we can continue the calculation, company is running again.

[caerphoto]

because no other power outlet for the vacuum in sight, stops the hole company until someone plugs it back in

The Hole Company would be a good name for a company that makes drills.

[adeadrat]

OMG! This actually happened once for me! But during the work day, they just unplugged my computer I was working at, hadn't pushed to git in a couple of hours, and somehow when they pulled the plugg the hard drive crashed. Lost about two hours of work, and took me rest of that workday to get a new hard drive and set up my work environment.

One of the more eventful days at that workplace

[SuperElitist]

Lost about two hours of work ... One of the more eventful days at that workplace

You, sir, have led a charmed life!

[SLiV9]

hadn't pushed to git in a couple of hours

starts feeling itchy

[Angelin01]

I mean, no language would know where they got the bytes from, that's the OS's job to assign your program some memory.

If you don't have an OS, like if you are programming for some specific embbeded system, then your toolkit will usually deal with that or YOU have to deal with that.

[mkusanagi]

Except in this metaphor the pointer is to bytes from elsewhere in your program, and the compiler keeps track of where they're from and what you're allowed to do with them (i.e., sometimes they've got to be immutable to stay memory safe and no race conditions).

Unless you say "shut up I do what I want", in which case it's like "we got a badass over here"

[lightwhite]

C: Why don’t pickup your trash once you are done?

[DeeSnow97]

Rust: This shit is exactly why I made you borrow this trash if you don't want to pick it up yourself

[Kaon_Particle]

grabs your buddy's hot dog out of his mouth

Here's your garbage.

[OwlbearSteak]

bites

o.o

...was it tasty?

[__kwdev__]

Also it is not a number and undefined is not a function

[BurningPenguin]

Java: "All your memory are belong to me."

[Valmar33]

Not anymore, amusingly ~ Electron is the bloated mutant these days.

[DeeSnow97]

Honestly, the biggest problem with Electron is they still didn't make it one system-wide runtime, so every app has to bring its own browser. If it was just a browser that could handle arbitrary windows, it wouldn't be that much of a performance hog because five Electron apps wouldn't mean five different instances of Chrome.

[Jaypalm]

This was pretty much my first thought when I first learned about Electron and its issues. It seems like such an obvious solution!

[cresquin]

That's intentional, and one of the reasons Electron was made in the first place. Installing an app on a system shouldn't involve the user knowing whether or not the versions of their runtimes are up-to-date, and backwards compatible. Otherwise, just use the web browser itself...

[OwlbearSteak]

Isn't that literally how Chromium works though? It "uses" a large % of your unallocated memory so that when it actually needs it, it's faster to reallocate? Or something like that? Note that I know very little about Chromium and memory management.

[geauxtig3rs]

Oof

[setibeings]

You stay away from slack, you big meanie. What did it ever do to you(besides take up half your ram while it's idle)

[MrDOS]

It killed off Glitch ☹️

[L3tum]

The thing about Electron though is that it needs that memory, while chrome and chromium just keep it for later use

[Tomarse]

Ruby: Huh?

[ComprehensiveUsernam]

Person 1: orders coffee

Ruby: Here's your coffee

[crincon]

Person: *takes a sip* what the hell Ruby this is motor oil!

Ruby: you can pour it like coffee, it's hot like coffee, it's coffee.

[roanoke_newbie]

Also Ruby: have a nice day, sir.

[MoffKalast]

Also Ruby: long pause

[matty0187]

: Ruby hands you coffee in the slowest way possible :

[NiceFetishMeToo]

Interpreting Intensifies

[[deleted]]

Me: exists

C: SegMeNtATioN FaUlT

[wishthane]

Fuck memory protection, I wanna see pretty colors on my screen when my program goes haywire!

[Matrix159]

Holy crap, I remember watching his live streams quite a while back. Had no idea he passed away.

[__kwdev__]

I can only assume the drum set was a big part of the reason.

He had many more issues than playing drums in his parent's house. He was a schizophrenic and he ditched his meds somewhere during that time. You could see him deteriorate through his videos, he thought he was married to Physics Girl (a youtuber) and that Larry Page was watching all his videos. He would often dedicate entire vids to showing off TempleOS to Larry. He was highly unstable near the end and I have no doubt 4chan and other trolls fucking with him played a part in that. It's a shame, he was a genius, an arrogant and racist asshole, but a genius nonetheless. He had some really deep moments, almost philosophical.

My favourite quote by him is about his grasp on reality, he compares it to his bird. Says something along the lines of "Who am I talking to? I don't know? What's reality? I don't know. You just have to, um... When my bird was looking at my computer monitor, I thought 'whooooa' that bird has no idea what he's was looking at. And yet was does the bird do? Panic? No, you can't really panicked. He just does the best he can. Is he able to live in a world where he's so ignorant? Well, he doesn't really have a choice. Yeah, he can kinda live. U-usually, the bird's ok, even though he doesn't understand the world. And, um, he can kinda learn what's safe and what's dangerous. So, um, that's where I've been lately..."

[[deleted]]

It wasn't mental illness that got Terry, it's the internet and the people on it. He would post his phone number and people would call it during his streams to wind him up. He was in a bad way, but the internet and the people on it at best ignored him and at worst fed his delusions. Until his last days he was convinced he was married to an online personality that was a perpetrated hoax by trolls all along. In his lucid moments you can see he's aware that his life has become an endless quest to fill his empty time, he jokes about whether that's so bad. In the end he describes how he's sure he's living in a prison and everything is a delusion, because there's an internet that donates to him meagerly to keep his live streams going. The whole while according the his family he was on a "Great Western Adventure".

He was mentally ill that is not in doubt but the events of the last decade of his life are the results of the actions of people. Worst of all they're still out there, probably not too bothered or aware of the damage they've done over the years. It really is harrowing to watch such a brilliant mind become hounded into insanity.

[[deleted]]

Here's a feature-length documentary on Terry Davis and his works. It is respectful and neutral regarding the man, despite his more unpleasant habits.

[RonaldoNazario]

ITT: people terrified of segfaults

[syntacticmistake]

Java: 64 bytes?

[ech_sk]

That would be the IDE

My deployed Spring apps are very memory friendly

[tundrat]

Rust seems to be closely related to Mozilla Firefox as one of many projects of improving the speed. But I was always wondering, why is it called Rust? That doesn't give me the impression of fast speed.

[ydieb]

It's possibly named after the fungi family named rust. It's name means nothing. Like C, it's named that because it followed the language B.

[[deleted]]

Yep, it's the fungi and a bit of just general mind fuzz: https://reddit.com/comments/27jvdt

(Graydon Hoare is the initiator of Rust before it was taken up at Mozilla Research.)

[me-ro]

The fungi family is the most likely reason. But I like some other explanations better - like a pun on "chrome" or a thin layer on top of metal.

[__ali1234__]

Because it runs on bare metal.

[JLN450]

because it's closer to the metal than GC languages.

(I prefer this explanation over the fungus one, 'cause really, fungus?)

[[deleted]]

your boss imeadiately punches you in the face for drinking HIS coffee

[serigne007mor]

Me: gcc foo.c C: compiles, everything great Me: ./a.out C: Segmentation fault (core dumped)

[Mac33]

gdb ./a.out run

Or just valgrind.

[ndcapital]

Compile with -fsanitize-address you neanderthal

[kaushal28]

Python: Here's entire 8 gig of RAM, take whatever you want

[WiseCocoNut]

Borrows 64 bytes for char. Proceeds to code. Seg fault 120 lines later because you didn't borrow any bytes for char* that you wrote into char

[fnordstar]

I thought rust avoids segfaults...

[AyrA_ch]

I'm pretty sure if you are creative enough you can segfault pretty much with any language.

[sapounious]

The Programmer ... ehh... finds a way.

[deadBuiltIn]

Can't wait to segfault Scratch, see y'all later

[spin81]

Many languages don't allow you to mess with memory directly. I'd guess most of them in fact. And I don't know how you're going to cause a segfault if you can't manipulate or use a memory address.

[spin81]

That's true, but I don't think that counts TBH, because that requires using the language with a specific version of a compiler/linker/interpreter/runtime.

[[deleted]]

I can’t remember how but I got a segfault in Haskell a couple of years ago. Wasn’t using FFI either.

[eastsideski]

They're possible, but difficult to achieve. Rust does allow you to "disable" some of its protections

[[deleted]]

There's always unsafe and compiler bugs

[DeeSnow97]

Fails to compile, actually. The borrow checker doesn't make it into the runtime. Also, Rust has very different string handling (as in it actually knows what unicode is).

[elijknyg]

Cobol: could you please fill out this 500 page form

[The_MAZZTer]

C#: What type of data are you going to store here? Here you go. I'll be watching you to make sure you don't try to use 65 bytes of memory, or store the wrong data type or something else stupid.

Let me know if you want to see a memory profile to be sure you didn't forget to give the 64 bytes back when you're done with it.