Rust Programming Language Programmieren in Rust (Full lecture, German), 18 Jan 2017

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From YouTube: Programmieren in Rust (18.01.): Interior Mutability, GC vs. RAII

Description

Vorlesung „Programmieren in Rust“ an der Universität Osnabrück im Wintersemester 2016/17.

Dies ist die Aufnahme des Beamerbildes sowie des Notebook-Mikrofons. Alternative Aufnahme (mit Dozentenvideo): https://video4.virtuos.uos.de/engage/theodul/ui/core.html?cid=f4a7c0754b566ef1f43345adaecc98cf&id=1b01a22e-42f7-4528-901f-df41557b4a05

Slides und weitere Informationen: https://github.com/LukasKalbertodt/programmieren-in-rust

Playlist: https://www.youtube.com/playlist?list=PL0Ur-09iGhpwMbNiVTBeHmIjs0GuIXhNg

A

One of the last today I wanted to tell you a bit about the project, sometimes at the beginning, and although there were now a few e-mails back and forth, I said a few chunks directly. It's good like that and get started theoretically on 23 with the groups e-mailed apart, try to answer somehow. If you have the feeling I didn't say: okay anyway, I don't be sure. If I told you 160, okay, it typically does that one e-mail was and.

B

A

All enemies answer quarter, 41 second e-mail No reporter can agree on that. I can understand that it takes a little longer now. Yes,, it's best to answer this week until Friday somehow,, so that we have it clear that it's a bit of a weekend and can start all projects absolutely,. So if you then next week wanted to start somehow or maybe a bit later, four weeks time, a few things I made a few bullet points, so I do n’t forget anything important. One time should use your kit that’s our only requirement.

A

I hope you all had plans anyway, but how you say definitely works. It would be best if you also used top. We can, of course also want something else. If you just have a private summit from the server or it works, there is also some online public version. I think david backes would like to use.

A

You can do.

C

That happy to choose.

A

The only condition is that we have read access at least repository cot, for example, good. If can produce or write down a few things, small or political comments. I.

B

A

I looks exactly the same on the other sites, but definitely shouted to have co and any possibility to tell you something other than to climb. That would be something good, so somehow see that you can do it. I would also like that, if you make it.

B

A

The whole repository so a natural step do as you want, but who's nice if it making it public, is definitely the easiest thing to do on github, too free of charge and uses a lot of an open-source license. I've always had a hard time choosing a license because it bothered me with computer science. That's just annoying, of course not, but please let us just one that makes the whole thing easier and you can go. The route I took the combine. What actually uses a license for almost everything I thought to myself.

A

It seems to be fine, so I used it for you too. They come out the licensed ones, mostly under two licenses. For me, the unep fi 2 see that, for example,.

A

The official us compiler tory also has both licenses in there that won’t be a problem,, so you’ll definitely find that if you’re looking for it would be quite good if you used it somehow or if you are still full of children, because it's just click, then it's ok, but if you then any open source license user sessions med, especially because I think that some really nice projects can form from it and if you don't feel like it anymore after the four weeks finally says that has turned out well, then I would like to continue,, for example, if you have the open source license, then so that and not whatever exactly like that say sorry, you know that you shouldn’t do two things.

A

First, use this repositories, four tasks, blah blah blah. They were now set the tasks new repository for crm project now, so that there is no need for the whole history of the tasks according to the environment, but olympic test. You can also see that this meeting is, of course, going well. Of course, you are particularly happy about that and you can.

C

A

Set it up for yourself, someone has to think a little bit about how to configure travis and how to even write the scripts,. But in the end you can even write a gravis script. That is very easy and then test the travis ignition area. If a create a simple cargo project- and I think it's just a line that you have to write that travis point, 2 ml says martino language is going to race and then you activate it on the hit page and then it works. So then, all the guests will at least combine those.

A

We can do understandable, somehow quite useful users, at least for all races use most projects that somehow everything makes sense. So.

B

Precisely that edits what we.

A

Do here, as said, if you want to look in there from time to time, otherwise the read access is flexible and makes comments, for example,. So we promise that we will somehow assure you every two days that your code is running in the right direction. We even look at citizens who are interested, but then we may comment and say: hey the whole project that could maybe be structured a bit differently or pay attention to it again that you really keep it as minimal as possible in kothen, for example,.

A

You could also shorten something like that, things like that will be said as a gift,, so we would be watching the whole time and of course we have to make private notes and then at the very end there is the final project, you already know. That is then on Friday the 17th, and there is a little more information,, for example, when exactly that is the tenth and the works is room, but we have ten teams. We have 35 participants in the practical things you can calculate. Maybe we will do it like that.

A

Then everyone talks for five minutes,, then we'll get there in a little over two hours,. So it'll be something like that. We don't want to make it as short as we.

A

Know from the FCG internship, for example,, where everyone is only allowed to talk for a minute,. I think that's a bit very briefly. I think we can maybe draw three things for two hours, but I'll tell you that again in time, something.

B

A

Okay, two more things, and you can of course ask us at any time- or mainly I don't have it at first didn't tell the tutors now that she had to be ready all the time, but you can just write me, maybe with your tone c c, if any big questions about the project like they can, this is the best design or we found this following problem before we can even start programming it. We have to decide which direction you think is better because of course you only have a few questions.

A

You can simply clarify what you have questions about. Project planning then write to me and finally, again, the hint you can best starting early is always worth it. If you somehow have a lot of time afterwards, if you need it, but starting early is definitely not bad for us. Yes, there are still questions about the project or do you all know what you can do from.

D

Next week, and have to.

A

There is then, as I said, that in the project from the code you look at us and the final presentation together ask otherwise good.

A

If your questions are tasks, you can still write an e-mail or ask piazza. I think then it’s more or less clear what we demand that we do in the weeks as far as exercise sheets are concerned, I will also say about that right now, but probably apart from this week,.

B

A

Come out yesterday, there will probably still be very small profit sheets. It will be seen in the last one. There was a small task on the topic of the week and a larger task simply to lose, and this larger task for programming that will be omitted if I am programmed on the project.

A

That means there will probably only be small tasks of on the topic and also probably less because you can't test it very well everything that we learn here and how.

B

Much I have n't.

A

Yet, but probably one or two pages after this week for that quite sure that it will somehow come down to it.

A

So this week is, but in any case you should still edit that you should take it out of there. I will, but in.

C

A moment, as far as.

A

This task is concerned, then one thing before we start with the actual police and we are almost at the end- I had a few things. I still want to do, but maybe you would like to suggest that you would like to hear. I would like to ask you again later after I have told my stuff, but so that you have the whole before this time to think about what is still missing. I said at the very beginning I would actually like him, then almost everyone can use it as a language just like that,.

A

So if you then somehow sit down during the semester break and everyone has something to program or you have to program for a course, then I hope that they somehow consider rast, and that is the case with many, probably not like that, or at least for some, and I would like to fix the problem, so I would like to know from some people right away. If I can think of something. What is stopping you from saying? Yes, I can program somehow loosely.

A

I would pull that as a language in the pool I would I would like to know afterwards, so that I still know what I can treat or what I can repeat again. That would be nice as exactly as I said later, then we will continue.

A

Now so we were four at the end, so we have a.

C

A

One as a repetition, so the most difficult topic networking from the last time did not pass this like tables, get much more dynamic dispatcher. So we can. We somehow called the right implementation of a trade method at runtime. Were you coming? We just use the range of functions and that somehow makes sense, and we have to make everything compact this function center, retail written, which is then somehow in the static memory of the youtuber, and so we can then carry out dynamic dispatch,.

A

But we also know that the honey dispatcher is slow and does not do dynamic, dynamic dispatcher by default,, but as we have always seen it with the tee that implements that makes static display over this mono physical and maybe also good, to make the camp dynamic that sometimes we only need 26. Then we got to know rock.

A

This trailer is always called when something goes out of scope and then also calmly potter that so much again with times the box that the normal big point he has quite simple, the just always consulting head goes: the water also includes dropped, and asia then got to know ralf jahn's counter against which allows several owners of a certain object. Usually don't have the truck like that.

A

We said there too continue. Now we 'll do a few other things that a few little things I've thought about doing easy, heinz we're not doing today. That means it could end quite early this lecture today, but we do n't have long to squeeze there. This week start here with, I said in chapter 3 when in and mobility come together, bad things usually happen remind us everything hung means. We have multiple friends on the same memory area or multiple references, something like that. That means we shared a memory between several places where it is referenced.

A

Mobility is clear. We can change this save rast. We have already noticed somehow doesn’t allow, both at the same time, because I made this thesis then bad things happen, but why, at all I hope or probably we all agree. If we have several tracks, then it is clear if several people live in one storage area at the same time and read and write very strange things happen, then some of them can read.

C

But the other country can read it and.

A

One thinks he already has been a part and could now inform that the other part is, or something else happens very strange things and in consistency and happen there. So that's definitely bad. I think we've all already learned or can at least imagine why it is with one bad trip, because nothing happens. At the same time, everything happens in quick succession. Why can something go wrong and then I would like to show an example of a few. So, let's start with this.

A

Here and your task is to evaluate, is it already uncertain, or is it still safe and if it is unsure on which line? It is now unsure what or what goes wrong it is to guest code just so that we somehow understand what is going on, which of course, is not complicated, because if it were unsure, it will not compiling, of course, but we just want to see what would happen there make a start on this example. We will first introduce vector and boys, then by the way, feel free to.

A

Let us know if you think that he already has something in sight. What will happen so if my element is pushed, we will take a nice friends of the element, so we want to remember the first one. Somehow we give out the first one we want to push a few more. We take the reference whether the middle element is also the second one and.

B

Now go through.

A

The first two elements again: nothing bad on the outside,, also on the inside, nothing bad or with someone that the others always think about it. For a moment,.

A

D

No reason or the.

A

D

A

An opinion so I would.

C

Say if it worked, it would happen, but it wouldn't work because in the place where I need v pushes two calls I, don't know whether it's a bad reference. I mean it's a good advice.

B

C

Already that's hidden there in the point, and I already have a normal reference that.

A

I think or 2.4.

C

Or something like that could also say, if I thought of this, then the urberach people would think so.

A

His statement is complete, for the first time in any case, does not score, but has not yet reached any statement about it. So.

A

A

We also have a reference object. We do. We need youtube once so. We want to change. It is needed as a youtube 1. The question is now: has the us compare quite what somehow impossible for a compiler to promise about any program whether it is unsafe or safe? Yes, that can definitely be traced back to the old problem, but ultimately the problem cannot be solved, because what compiler does so that there are also some safe programs april rejects so that 's kinda pretty easy.

A

We want to approach a problem, so the us campaign also rejects some safer programs, but at least land all unsafe ones that 's the trick behind it. So first ask the question: is it safe or unsafe, so in real life.

A

It would be safe is certainly ok. Wonderful, worked out like you, because such a rector.

C

Phantom, certainly wonderful.

A

A real one, you know yes, he always doubles some save colles so first alone in him, something from mercedes, an element guys things that this time here always single, get us on the route. Paris to that by the sea.

A

What's happening now,.

C

A

Second fund.

A

Is planned that it's also too trivial? Finally, a coup planned, so here we have a technically.

B

A

Was I have to push it, but I've already used up my capacity to the full. That means I'm doing something of vector. I have twice the size of the memory here, so it is not enough new and that is first copied everything super is we actually filled it out wrong? The two years copied.

A

So highly uncertain you just didn't notice it, and that shows it again quite well is that there were actually many years of circus program here that we saw something at least once we did. N't know that either they plus that doesn't stop me from doing that.

D

A

Learns it, although then.

D

A

Who exactly but then it succeeds. Nevertheless, here you.

C

Could, for example,.

A

Solve the instead of directly or forget to save indices, if you want to have a selected elements vector, then you can save the index, then the index will of course, also be validated when we are at the front of the plant in foshan, so you have to always thinking about when things would be validated, but things like that were hidden behind it and you do n't think so. You don't necessarily think that something like this will happen here either. We didn't think and.

B

C

As I said, it's nice.

A

That mira didn't think of it either are, although 1, plus and c++ sure want to write, of course, so what one misses? Yes, so mutation can always references somehow and validate the word, the only example about key. That means it doesn't always.

C

Have to validate in but.

A

It can always do that in a chat too, and this aliasing creates such dependencies between different parts of the program that are hidden there. The.

B

A

Can bend his own pointer without any problems? He has full control over this and if you are vector, of course, nothing at all about all the other friends, then it is somewhere on his data show. That's why the friend the rector has a youtube fan in addition to the push method, so also an exclusive reference. He knows there are no other references to what belongs to me and that's why the rector can copy the mother that nothing bad happens. So-Called, that again, trust doesn't work anymore for a good reason.

A

Other things would n't work otherwise, either for a bad reason. But, as I said, you can't reject exactly all insecure programs and allow all safe ones that somehow, if you have something like that, it's impossible and another example again literature in aviation, that can also be the problem that you always have a bike tour via integrated java, and then you want to delete it from the list.

A

Then the moderator destroys what you think he thinks about the bike or delete that or just others work better, so that you.

B

A

Proof it 's really always problematic, maybe again to the idea what.

B

You do here in.

A

The crash of which, yes, but not in java, there's a rail that has exactly the same allocation scheme in the year. We were two types of guys: the primitive data types are always copied,, so that means we wouldn't even have the opportunity to have a reference at an event. If you just can't do it,, we always only have value for finances, there isn't,. That means the inside is in there, but I would n't fold the line like that,, but directly as a copy of what's on deck dollar, and that's with the non-primitive data types,, I.e.

A

the classes, etc. they're, not even right here in the way of a data ready this. Finally, all boxed on the are like a box league last time.

A

It shows again that is set and if I then get a reference from ours, then the speaker always shows the actual data. And if here on this difference so in the year, there is no possibility of a difference from stec to have in this memory in the rector's area,. But if it is only one level further and that's how you can prevent it,.

A

B

Were to be repainted now,, this would.

A

B

Two references have.

A

To be made here,, we will also count that in the performance chapter, maybe that's not bad either the dsm. Yes, as far as the speed is concerned, but well we'll.

B

Continue now, let's do it again.

A

As an introduction, and now you might notice something else, that's another.

C

A

Wrote two documentations for you last time meeting counter and with clown. We wrote this here: the field, something strange from.

A

Werth island, exactly somehow we can't keep this record, but actually no longer in it. I've already said this number, not even when will it be written differently somehow, but something like that should then be noticed at some point. The clown trade is fixed at the clash world get in a youtube one in youtube fans often themselves, because that's how you assume, if we clone ourselves bein, then we somehow only need read access and then we can clone ourselves to special cases. Dilemma shoots, you're, not the case, so that wouldn't work.

A

But how does she do it anyway? And if we somehow want to bring about a change through a in youtube de france, we would have said: that's not possible, but there is probably a good will with the so-called intel team. What we want to talk about immediately another example that can be useful. Yes, his type that we sometimes want to give out on the date, but it's quite difficult to calculate the task. It's not that trivial to come up with an example, but you take.

A

You have some count and we wanted to output on the terminal that will probably work for small graphs, but to output. Something like that on the terminal would be very good if the planner advertises. I don't know if it's enough about graphs right now, but if you can draw a graph also a sheet of paper without that I knew the plan is completely new and you would like to have a graph planner like that,, but if you think again,, we now have a kind of license list or matrix that doesn't come directly,.

A

You ca, n't immediately see whether the Kraft plan a so there are planners a rescue algorithms that just test, but that planners also say where the nodes have to be located. So at some point we have to fill in a complicated algorithm to get this planar representation of a graph.

A

Maybe we want to save ourselves the fact that you have to so make.

B

A

Deal such a cache cache to live things out are just.

B

A

Now I always have it very easy, but we were somehow looking to see if the cash was already worth and holding, then we can just give up the cache, otherwise not even fill the cache, but that too fmp trade has my hits on youtube, which of course, still exist because somehow seen from the outside, logically, nothing is changed internally. We optimize with a cache, but it didn't have to concern the outside world.

A

Yes, and now, let's talk about what that is, we are here more with betty in the end is the only thing that comes back to that we can come from anything we want to be with and anything where we.

B

Have a youtuber.

A

Red wings on a youtube fans- yes, that seems to be highly uncertain at first, and there are just a few jokes cherry youtube. Containers scherübl means that they can be distributed in youtube frances. So if I distribute you merkel, I can enter that. He only makes a youtube reference in youtube serious combat. So you notice that a few and they allow a good upbringing. So a change in the inner value through a narrow hatch. There are variables for use in a fed, sell and raesfeld.

A

That will look at the same and if we work with more heart now, with ex you've heard that before and lures europe, actually the loco is better, but with the ju tags is so well known that the index is also being used at the moment, although it is actually even better, but only now we will take care of the whole professional training.

C

In the next chapter or the one.

A

After that sell on residence, but look at the question is, of course now. It is not unbelievably unsure how it is with our vector example: we can't destroy it with it or whatever. That is something has to be clear. Now that we have a problem, the problem will be solved by all these containers in teheran, making sure that nothing goes wrong internally means either through the ap that prohibits access to the container or at runtime.

A

That means sometimes, then exchange with these with these parties to this complexity, of checking that no incorrect access takes place so that not everything in the computer is formed at the same time is checking or not combined with it, but for runtime has to be bad now, of course, it should n't, be so check, runtime things, but sometimes it makes sense to do that.

A

Lack of so we could see an example you could create. We put a new integer in with that who wants to do it right.

B

Again, this is n't, but with youtube.

A

We can still say points and enter a value and in any case, we take the old value and calculate plus 1 that works. If we have such a function, where we get one on youtube, is on a sell and can also turn that and then it's very clear that everything works.

A

First of all, it works cases with copy types. That's a restriction for these parties and the action good access to sell, looks like this dennis said. It's somehow safe.

A

Nonsense join in.

C

Zb sap then set the value in the function copied in the most.

A

C

Reference passed. That means, then it can count, because you simply point out that someone else had references to exactly.

A

In particular, because geese in.

B

A

So money copied that always out that means we don’t have any sinks in the actual sense, because no one really contains references or friends on the intrinsic value, but all of them just contain something of this kind on which you can say set this value now or leave this value now and that everything only happens in a second. There is no real one, that's the trick there and at 1 and it's safe.

A

If I always say it like that, you think okay, then I'll make a second bed and rest now sure done as we will see in the next chapters that does n't work. So let the compiler forbid that one l over with more the very last part, that's all somehow secured if we later understand exactly how it works when I say in any case, that's only one thing for sure, then I mean the rust compiler is preventing us from dealing with meltdown and in particular this box.

A

Has this goal better said at all: has that comes to exactly the same is mw what we would also write by hand simply by the einstein have that we don't issue any references and that we have new prototypes so far, so good, otherwise somehow works now, but sometimes we do n't make prototypes By the way, that only one copy of a type works, you ca, n't even try our way, for example, to make something short for a short one,. It does n't work at all.

A

Create a grid an example: now a bit stupidly chosen we're using a station wagon again, but now something else could have been used too.

B

That's not over.

A

For a minute either and we're going to start over again, what's going to happen, what we're going to do now is that we last this youtube was also. That means we say explicitly. We want that now started and then he comes back a degree. So, first of all, this boat only takes help again, not news 11 that could n't call it there. If there ten youtube is and comes back, then a degree, that's something very, very a very interesting patent. It works with the drop like that.

A

The guard, that's kind of like that, not necessarily bouncer, but again a steak, a good one, but like a beetle through the garden, we can access the data because we do n't get high youtube fans. We do n't get direct access to the data are only through this gave because this.

B

Garden directly.

A

Notes your news like that, and if we have that, then we can do whatever we can simply with the the operator on the actual data access and then, for example, increase it. So if we called again for the nude, then that would be pelican, because we obviously can't do that. We should n't have two simultaneous interests.

A

When do you think we can call for the.

D

Nude again exactly.

A

D

Does that work?.

D

A

Believes that, and especially the Rostocker doesn't know that yet the guard also has a connection to the f cell and the guard says lars l, then okay, I'm gone everything is free again marcel contains such a tree state internally, where she remembers. If I just built in jubilation or built a musical, and this guard when it is created, then sets the webstyle for itself. Hardly any bauer stage is otherwise, for example, the example. I am your audience and if the garden job like now, he says the part.

A

Okay, everything again, of course, now the ball state again on what I did n't build either,, for example. Why.

C

This box, or why does it go back to where you are, then I could have created exactly the same thing with anja immediately. I.

A

C

A

Said exactly that clearly, whoever is now he'll come.

C

To that it doesn't.

A

Happen to me error. It's.

B

Natural, I also started.

A

Wondering why panic those were there isn't? Some point are your value where we can deal with it, but it's always a programming error that doesn't make much sense to test somehow, if you, the program, can also, by the way,. There is a wedding, judt method that returns the number, but you never really want to use it, because actually it is always a programming error. In particular, it will not help waiting for what you scan from newtec, for example,, you blog the current step until the other red still somehow jobbed.

A

That will, of course, not work here are only in one thread and this 1 web. Somehow everything works according to the bacon principle. That means, if I call somewhere or with then it ca, n't just stop and wait run we're the only country that just happens nothing more, and if you put your mind to it a bit, you can really need it. For me, it's just missing. If you need it very rarely to test whether it's really just built, although it shouldn't actually.

C

A

You can, as I said this description newton meter like this, and here the guard is dropped and everything is clear again and then we can make up for it. Again. need courage called by the way. There is, of course, also the bongo method, which just read the bread on it. I will panic in here, but you could at the same time, in Barossa.

A

Is clear about that,, so this website unfortunately, has overhead,, which remembers a tree earring state and tests whenever it is built and is currently invalid and an invalid data pack,, which means we have a bit of overhead there. Well, no question so far is an overview of things we have learned if we agree we can with assi and if appropriate tag have several of an object.

A

You can share an object with us all these pointers this smart pass on, but only in the youtube fans on their inner values, back, it's clear they 're distributed. So it can't surprise him to return these containers here on the right side.

A

They're there for you to reference from youtube platform, youtube de france, english isn't particularly nice, but she doesn't understand, and then there are also the corresponding things for the moms trading application that we are still negotiating, as I said, atomic something so the boys more like that types that roughly correspond to the atomic only work with certain kopten and this website is there in the morning training session. That also corresponds to this double. You look this minute.

A

It's actually worse to know, because micex can only say I want complete access or I don't want to hear complete access at all. With this double you look, I can still decide. I just want read access now and so on. The goal is great, but that comes later and frequently used, and that one often looks is this combination that we first have an assi and there is also a website in there.

A

One somehow wants to share something, but we would also like to help some where people don't have something so much always like to complain a bit and laugh a bit about it,, which then often gets quite deep, so you want it or you often have types like that with many subtypes, you can somehow add an option or slowly. You already have somehow three levels down, there's always a little laughter about it, but it makes sense. It's not just that.

B

A

Need it sometimes, you just have to have a doctor, and sometimes you just want to have a red cell, but they're also very related makes sense and in the multi trading area it's just that here, probably but the glock. You might be happy why we use it. We already have a great compiler that says it can actually be found out at coffee time. Why we.

B

A

It for several reasons. One is a reason why sometimes we ca n't really prove it. The compiler tries its best too complicated to prove that the program is safe. It doesn't always work and you can't always do it. That's why you sometimes have to tell it. Okay, don't worry it's kind of a security company when Do you still have too much time and effort to prove that if, for example,.

A

We have some very complex structure and there are somehow several components in our program that are called up one after the other in a game, for example, once in each frame and have to do their things like this, and that now all accesses somehow need a global object,, I.e. any object that homes exists,. How do you do it now, of course,?

A

You could always enter this global object in all methods via youtube de france and meet it on youtube,, but that then makes all the methods everywhere where you do something wants to cover that makes it thick. So the method is then stopped in a few meters. It's actually not nice. You could say, for example,. Okay, that happens. Everything comes to mind, whoever several components are clearly executed, one after the other, they all just get a rest or a as a red state of maine global object.

A

Sometimes it's just plain easy to do it that way, and sometimes it also.

B

Needs because this panther, the gmbh.

A

Wants access and park you just need to give the multi threading motif rating longer you need these things. Rest allowed For example,! It's not at all jubilant to spread things over more than that,, which of course, is understandable,. So these things definitely need to be communicated between different tracks or less,.

A

But of course it shouldn't be so easy to check up the motto that is, of course not always when he is from doctors too easy. That always- and I hope you noticed that fairly quickly. This event here gets significantly more power errors and significantly less running time spring. For example, yesterday I more or less had the sample solution for the tasks programmed and only had a runtime error, then really and I had a thousand defenders before, but the parliament always said something right.

A

If you just use that to replace a complete one, the developer designer peter exchanges springs too loudly, so it doesn’t get you very much and compiler 4000 students really only use special cases if you notice, if we do that, now that a complete one can prove, then we would make all our functions uglier or something else.

A

Then you can use that or if he just do it, it's impossible good after a few other mentions where you can get mobility for pounds in the interior,, namely if you already have your shares in july on a file and you can still climb around it because it's still widely implemented. That applies to some things,, for example, tcp stream.

A

These are just a few examples. It 's not like we can do anything. I can't understand that you can't pack any special things. He can't pack any struck, but it can maybe fall on it. Okay, we can now somehow change the world with a good reference. What? Yes, what you sometimes want to.

B

A

Just a quick note that you've seen it before so there are questions so far. Okay, then I'll tell a little story now. So that's a bit of an excursus or a bit of simple theory,, whatever we want to call it Let's take a look now why it was maybe not so good or why it's explained. Well, you don't know, and somehow what that just raider too far doesn't always want to name all the individual letters about that or what that exactly is and a lot of it was taken from a pot.

A

Not this one and the title sponsor might be a little bit what I will complain about there, but you can definitely check that out, but a little bit knew a lot funnier than going aloof instead, more funny pictures. So let's have a look. Let's start.

C

A

Little game we want to find a memory, location, +, + I can't do all c++, but we 'll try it anyway. So that's a plus, as it was written decades ago, has to a class. You then have an outdoor pool event filter for which that is always good and has a pointer on it. If you somehow don’t want to save it in your class, get pettersson constructor directly with.

B

A

In and your problem also plays in it, for example, will.

B

Probably young players there will.

A

Remember again, a moderate spurs which we then let fight like this, and this end says now I have strength, is on, is weak or whatever, and in this.

C

World happen that certain.

A

Things we like to do are there: it gets information from the world to us. So if something happens in the world, the energy wants to be notified. I know what could happen there. There can definitely be many events happening in this world that the energy may be interested in.

A

We stood new event filters because we want all events get out of the world, but we want to come and color like, for example, the bridge from it collapsed. Then I have to change my search algorithms and can no longer go over this bridge and then just say, ok world. I would like to register here. I would like to be notified with this event. Filter that is now simply created.

A

I'll tell you if she's a smart, if that 's a hit with energy, then I wo n't just go over the broken bridge, so the band filter will say: okay, events over a broken bridge, I'd like to I hope that.

C

It is roughly clear.

A

What the program is supposed to do. Ask, it now. The memory is.

C

The event. Please give me a new event, and do you have memory for it? Here?.

C

World responsible for releasing, I assume that that won't happen,, especially since I don't even have a reference to the säntis myself I'll, give you.

A

The exact right here in c++, first of all, that's difficult to say who actually has new year's eve? We have one on it today, but.

B

The world has now also a pointer to who.

A

Has to let go it's always the problem in the plus. You always don't know who actually belongs to who is responsible for it. That's somehow the concept of ownership which wasn't clearly communicated in the earlier c++, and you can always often error, because the wrong one deleted it or the right one didn't delete it exactly.

C

A

The lead is missing unless the world takes care of it, but then we may not have anyone on it yet so somehow it's not all that clear. A hint new c++ is possible. He clearly knows better. So there are a lot of conventions how to describe who actually owns them. They have improved a lot. These are actually the conventions we use right at rast that you made sure that they are observed. It can happen describe us as that we don't say, but which is quite obvious.

A

Even if so, that's the actual the the storage is next to the programmer will probably fly to see. We have a you there and don't look directly at the tenants, so we have to somehow the world communicate the world that again the ditib. So now the example where yes, we help but can no longer help. We have another class so the last year we have.

C

This racing filter.

A

That now no admitted but a yes, what he all any reference automatically, not a primitive typical. That means we own and in the product. We do exactly the same thing actually was yes, but, as I said yes,.

C

We know everyone always says because.

A

Everyone has a reference too, and everyone could keep it alive. The reason responsible for the fact that he, the path, warns at the end, and there was every reference that keeps the object alive- is everyone who comes without so yes, this new here there will be dark, no matter who now the reference falls on that the world is or whether it is my energy. It will be deleted.

A

We'll take a look at what it might look like from the outside and we'll also show a little more of a list of nrws and now everyone in the world somehow, and then we have in some loop. We then have if something happens, when the time has expired or otherwise what then we feel again call me to do it and at some point delete the enemies from the list again, e.g. they may be dead. We need quite a bit of my list so can already imagine it happened.

A

Of course it doesn’t show, then that might make foul.

B

D

That one route was ok at first,.

A

But as long as it is cleared away at some point and if fuel storage is possible, yes,, if we have no more storage,, then maybe it will also be addressed,. So in four at the latest, thematically did step,.

A

But never that,.

A

C

Will be briefly.

A

Mentioned this wild is now also in the world until handed over, so that the world can call antons something,, for example, call back blablabla the world that exists, but somehow for the whole game.

A

We can somehow delete the nice first list out, but the world still contains after reference to this energy, because your cattle haven't used it for too long. But somehow the world contains the world now does not contain its own list of nms. The world only contains a list of from event the sea wall, so things any things. The events want to get yes, but the world contains just on this friday or this friends. That means he, I think, laid there ca n't do anything.

A

I used this powerpoint freedom drawing tool for the first time works very well, so gc of the genders doesn't help for us here, because at least that was the people in this lecture he said he had dix the memory divided into three categories. There are the very classic ratings for a free where we create something with new york, and we forget the free or like the very classic. Then it's also these lincke ring objects. Verdi said these are objects that are actually unused, but still have a reference year somewhere.

A

That means the director would take care of things that no longer need a reference to delete them, but the coach looks he does n't care that there are no longer any references to things which we no longer need and get the classic departments where we don’t close. Anything else lies somewhere else.

A

A

We have to tighten it up.

A

World, that's just most of them lies in the area of occurrence, be careful, you adopt significantly more memory or use memory significantly more often than something like that happens and than you have other resources, but it's still not the only type of league there is, and he takes care of it in order not to have the other two. At this point you have to think about it. Somehow, with the gift player, we had promised that he wouldn't allow any memory, but with the ring objects, we can also manage memory dix.

A

So it's kind of a nasty lie even worse. Otherwise we promised that they do, but he doesn't manage to cover only one type of link very well, the one that occurs most frequently, but it's still only one type of link, maybe first to ask what it allows that classically. You say something like opening a file and closing it with In the end,. The special descriptive depends again,, so the operating system manages which covers which which process now has which file open and so on.

A

It is best to close them again, so that the operating system or network is almost exactly the same thing as far as it abstracts and the same thing and others things, for example, also a database for bin ja or some connection of another protocol, for example, a chat client, a chat, client communicates with the server and if it goes away, then the client should please log off and say tell me away. If that doesn't happen, then you have. Maybe you used to be on the road. A lot before saw this pink timeout. That happens.

A

If you don't log out properly and at some point, the server market does n't even answer my minute, pings anymore, because this is probably gone with maxis now, maybe not so bad, but if I am a server, but the mercury accepts thousands of requests per second and I close, because my database connects. That might be true if the database only notices after a minute,. So these are the classic examples of resources.

A

The whole point of the matter is he has that noticed that memory is also in a resource, so kinda anything actually can be used as a resource around so definition of cute? Is that just needs an open monastery andechs?

A

That means something I do with an open function feeder, so I have to have that come up in some way, first and way of a file open, now open tool, connect to a server store, adopt, that's all open and, according to the listened, was a dumpling, which I should also open, sometimes with less bad and sometimes with more bad consequences.

A

If I don't call los, also free for my memory, is that maybe not so bad if my africa to change it runs out anyway, if it should run for several days with an application that might be stupid, if I don't recycle memory with close for files is maybe only bad now if a large application has the files are constantly opening and at some point the system will have so many arrow handles or something else, maybe not such a good idea, and because some logs or other things can also get much worse, because you do n't call them up klaus anyway, we have them also a monastery ventyx who say that its resources- and we always want to an open, also endlessly have the solution to the whole country or whatever that stands for resource creation, and this name is not great that everyone finds even the inventor of the name struck.

A

The finne drives plus does n't think the name is particularly good either,. So you ca, n't, actually remember the branch that stands for and his team is nonsense, doesn't really describe it.

A

The resource and the destructoid that free so easy and if we generalize them somehow and also refer to war first, we can say there is a district that is responsible for releasing the sweet. There is a fixed function for that, and this function in rast is that it is guaranteed to be called. You now know how the guaranteed is meant. The compiler cannot guarantee it one hundred percent not always stop, not always the plus, but more or less completely guaranteed. It should always be called in any case.

A

Also always deterministically, and this weather can do all of these somehow eliminate three types of links. Then all of these three types were just a way of dealing with resources, and if we imagine that resources are, namely that for a 1 1 for an open also has to be a brain lump, then it is pretty clear that we want to invent such a pattern where we create the resource somewhere and then have a guaranteed call of a function where the resources are accessed.

A

It 's just good that you might think about it now or, if it's not quite clear to repeat it, we can, with left, for example, avoid by releasing the memory again in the ds print of the funbox samir already seen. We can also release in the ds print from more relaxed if the reference potato is in the arrow of contrast. Also there. The file is closed. Your job called we file all.

C

B

Things there is.

A

Just block used, although maybe we can't just unite the two worlds- that first somehow have to worry about this for the most part, but not at all anymore and for the everything else users of this saver. That's exactly our idea. How does it work, then, in java knows that someone is coming yes, but these perpetrators used the structures.

A

Determined one said a problem.

C

A

C

A

With the exact price completely done, that means we can't do it for a long time that 's destructoid now no that's unreliable, the sector there. He comes here.

B

A

Cleans up what suits him or when memory is needed, even explicit calls from garmisch against the gc collect, don't always do that,. He really has a bit of his own will and these fine ones will just call it up at some point,. Maybe there is a very interesting question on sap software, which definitely has six, and there are a lot of funny answers, so you can ask yourselves through teachers, among other things, this answer.

A

He definitely doesn't have that much trust in the sector and in fine reads, and he knows what he's getting from because he implemented why at the world championships. So in the end, it's not necessarily the best thing you can do the most sensible answer to this question from which woman is you could use fine lines to check whether the user hasn't forgotten beforehand manually to call the close and then with that will help, so to speak, a code is but chapter would have the chaos open, but.

C

That's just so open. Yes, if.

A

It's just called easily, then you can test it again. So no rice will also be called at some point, not deterministic on at the end of the club. It may not be called at all the gab spektor is only active when he feels like it or when there is a lack of memory, and if your program ends quickly, then there is never a lack of memory and the joints are never called. That can also happen will be final.

A

Eis also never called for your objects, so I can absolutely forget that let’s come back to the disadvantages of stretched one after the other. So there are a few things. On the one hand, there is a completely wrong feeling of security it’s. Not all. There are problems or not all resource problems, but promises, and so to speak.

A

That's it so it pretends the program remembers, and so the programmer doesn't think about it at all, I was n't really aware of what the existed actually allows, and then you just make up your mind, no thoughts, and at some point you wonder why your program takes up so much memory. If you still think that was a very nicely constructed example fatal that is not necessarily constructed in the small program, something like this probably doesn't happen, but in larger programs it happens without end. So you have pointers everywhere.

A

You can use references, then it happens very quickly that you have such a link rank six, which you can then deal with manually by the way. Yes, the programmer thinks you don't have to worry, but he also does it not tasty more difficult.

C

To solve these.

A

Other problems, because when I used the structures,, the first ones work really well, and there are a few other things that do n't work for me at all,, for example, this part of this type, this borgard that will be dropped deterministically on at the end of the coup. We can then deterministically call for a boycott again without something exploding,. You couldn't write something like that for a patent at all,, so that it.

C

B

A

Impossible and what's still very important.

B

A

Me, this gave schlecker prevents programmers from pretending he does. N't have to thoughts, make a real thought, because this is thinks about ownership and when I share, something is not only what makes sense tells what happens. It also already used just not checked by the compiler, but such a thinking that actually always makes sense. Of course, if you just want to keep it down quickly, then you're happy about your logic, a __, ] collector, but actually rethinking always makes sense.

A

You have to get in there first, if you're not used to thinking about the difference. Of course, it's due to the stumbling blocks in the way of programming I, really just want to focus on my logic, concentrate space. What you are now thinking about signature. That depends, as said before, that makes a big difference for a lot of people and, last but not least, what is actually always said that of course also slower, even worse than some disadvantages. As far as the running time is concerned, there are generally slower there.

A

Yes, this double world pauses or somehow the whole application is stopped for a few milliseconds to clean up everything. I think of myself, of course, I'm somehow not in my business application, where I control a encoder and my game where somehow every 40 milliseconds a new frame should be produced, then that bothers already a few milliseconds break. Always yes, and it needs my hand. That means you can not load and execute on any small chip, but we always need this wm, for example, so many disadvantages.

A

I noticed a big fan by gabis collectors, and maybe you will also notice that in most cases it is not a good idea that fasting makes it fortunate to do so, while at the end with a little story about it, there is a demand. Then there is a.

B

Small summary of this.

A

Chapter that you can read through again, very briefly, to take home direct edge viewed for the fractions, continue to get in a table static display plays. I get my motivation right and I say I always prefer: if it can, then it's faster job is the distributor in which rape and drop is extremely important for a lot of the patterns.

A

We are doing right now got to know such as smart continue or something like this kind of rsl, and I just told you that exactly they got to know a few distinctive ones that we will use later,, especially in the multi trading event and interior. Please, please, love completely. For example, this group, somehow the whole thing had n't mixed up a few topics that made sense to some extent we'll be asked to watch the task and then another thing live program your beforehand. I hope that he might now have some idea.

A

What else you want wanted to learn? First, does someone have an idea what they would like? There are.

D

A

There is a blatant. There is really only.

A

One thing that is, of course, simply related to the fact that you are still quite young, but I would also like to see that we want to change that. We want a simple way to represent something, and with java you can still give one halfway just make it. I think the city library has it or stuff from this.

C

Java, gui and.

A

I know the name, but I think it 's much easier than in lost. That's true, of course, now something that I ca n't do that much of an.

B

A

Can, of course, somehow see if we choose a quiet corner to do something with it? Yes, I could maybe think about it, but.

B

A

Not to the core competencies, he again experience, but that's good that we say that maybe try again simply realization, yes, so just sort of renovate something to see how it works. Yes, very realization, sonic, not specific, but he was right when he said something like that is important that we're good. If we'll see it pre-programmed or something else,, so yes,, we can maybe do that again, that we look at it, I've already mentioned it, a lot, which is pretty good and that it will soon work on the stable, rast, well,. It's good that.

C

I'll, do it again to do in the sense of what exactly turns it off and where exactly you pay attention to it,.

A

C

Also in combination with ebbers again, would have to go into it again, very clearly where you can break things despite compiler help,, but again, to see examples of how we are doing it now this week, always doing just right. Take.

A

Me for the very.

C

Last time are nice to have an overview of which is nice to already.

A

C

And where you can look for it, maybe.

A

C

In the direction of community, if you want to work.

A

A

C

C

C

C

A

A

Right that you're, also very lucky actually with ras I, have that the community I've already said extremely nice and helpful, actually always ask about everything. But well then I would say if you don't do that in the next in the next week. That makes then at the end, then, would be knowing again about the whole infrastructure to rest, to talk and about the community and how to deal with open source. Is it going.

C

B

C

In the sense where you can find out what changes to the language that has somehow become very clear, that relatively many, it is still in its infancy, amstel ben ali, is that you somehow have to train, which newsletter.

D

C

To write something in two years time that some.

A

C

Corresponds. That's true! Yes, that.

A

Sounds all good,, otherwise the idea, so the question is now: would you wear yourselves soon at a next lecture or something you can and any language you would dare to do something with and if you don't trust yourself, why not of.

A

Course, it's probably nobody to report.

C

I almost have to to say that I have started to understand every other language.

C

It was like that before, but I was allowed to learn.

A

C

Go go, the rector was sympathetic and there were a few things that are very nice and frosty, although they have become a bit clearer, especially, the flow is not available. Every time you have.

A

A look at c++ you can do much more than fun, especially, for example, this celebration, no tips or maria of the templates and all this nonsense is huge. E-Plus hasn't had almost everything. Yet that's why some things from c++, but I miss that really nice, that better more.

B

A

So, as I said, if I wanted to hear something, we can still do it so that we feel more secure with them of.

A

Course some are not here now. You are welcome to send me an email. So not you, but you also mine against what you want so really really interested in what still somehow has to be needed. Then you can use this anonymous form again,, which I introduced at the very beginning. If you don’t trust me personally rather than writing, he could actually say it's not all that great go ahead and see for yourself the form the company hasn't used by the way. Yet I don't know why.

A

Maybe it doesn't work but I. Definitely don't.

B

A

Complaints yet get it and if it doesn't have any comments, then let's have a quick look at today's task from this week and it says there are two tasks.

A

Again, there is a small one that somehow fits the topic and a larger one that doesn't just relate to the topic. Do haas no star now has the task of a mentioned. Evil departure heart as quickly as we want to prevent the web from being called up with evil means. Yes, and it says here somehow this is not the task. So few seems to be okay with the concept of his subject.

A

I would like to do it now that they point to each other, but yes,, some things for behind the as kompalla and says no, that works,, so you have to snip.

B

A

If you, if you really don’t think of it, then it’s not so bad if they skips, but in any case tries somehow it would at least be good if her death could be announced. I tried that, but I just can't get any further here. It could also be that you happen to always have the right thoughts and decide in three minutes.

A

So far- and the second task is a bit bigger- is like the last task so a bit. Let's just take all the things almost use it a bit and that's supposed to program the tic tac toe game.

A

I don't know the most interesting game you can play, but it's easy enough me don't think about reading the text. There's too much going on. The idea is that she builds a game where you can let different players compete against each other, and these players are either controlled or human controlled and he could say, applications now: human against computer, for example, where the can say human against human, then it is always read in alternately from the terminal, but you could also say computer against computer, to see how the computers compete against each other.

A

In computers should have two games, some in a stupid player who still fails a move as, for example, a accidentally. He does not make his move where a cross and a circle has not yet been made somewhere on the field, but somewhere else and on a loop or ki. That then somehow at least makes something better,, for example, making sure that if it could win with a move that she picks up the train, that would be very good and that she reads it in a little bit by command line,, but much easier, for example,.

A

It could look like this: I can do that, we'll do that soon,. The task pretty much under specifies what exactly it is, should make sense.

A

There is a little bit about the task now that you think about a structure yourself, because I saw, for example, with the edges tool from last week,, many people wrote that a file was written, for example,. It might still be borderline okay, because running tool, but Of course,. Some module structure also has several files that want to be divided, up. Somehow,. What is tidy,? You have to think about something that was also without hens. Surely. You have to do a project.

A

You are faced with a project where you don't get any exact specifications and you have to think about how do I structure it that now properly makes up. The majority of this task here is a list where it says what you should pay attention to. That has nothing to do with dictatorship, but simply we should program so module already said always avoid double code. There is almost always a place where you still double knockout pulls the man for my little abstract can then, of course, make sure that the code sections are as short as possible,.

A

This is also something where you obviously need experience and somehow have to have whole methods and a head,, but such helper methods can be an option or a bike tour there. You formulate very, very many things very very briefly, then, against the three lines could be combined to form an island or something like that. That's always better. Then you just have to practice a bit by looking at yourself again and again, and then maybe not looking at what the perpetrator looked at before has already said to my coach.

A

What could be simplified, but the last thing is that you use the strong type system in other languages. . Some things are strings that are partly trained means that everything is in spring. The runtime somehow looks at the runtime. What like that right now should be used, I.e. whether there is a number in it or something like that. It is a very insecure type system because there are practically no different types. It is always looked at like this, and there is no compiler make sure that the right types are used.

A

Then there is something like that from its center is like java. Has that has type man gets annoyed about tennis matches, but it doesn't help that much either does n't know very strongly. Typed is in java. You only have one integer type. What if we now want to represent an integer type, the can only accept the values between 3 and 11, of course also have that it was programmed. But what is that? Just the thematically fits use, the system more to say to her.

A

Okay, we accept a value here, but we do not accept 32. We accept that. Just that I don't get a name from the type that represents a value between three and eleven, and the designer of schuh makes sure that the intrinsic value is really between three and eleven that 's this strong typification that helps us all or many logical errors accrue as time goes by to find and we're just doing a bit of testing,, even if that reveals a bit much,, namely tic tac toe scratching on it,.

A

First of all, we have to somehow represent the field. You all know dictatorship, so we need new fields and you can say: okay, for now we take new positions, camp raiders. We also get what's in it. What do you think I'll? Just let you think again for a moment.

D

D

D

A

B

A

B

A

Exactly right, we'll just do it in jena was other, is blank the cross and called circle or full attention. Yes, you can do it somehow. It would, of course, also be ok to say we have a cross and circle in it or and aids, and then we have an option from these opponents in our field that we are also ok in both In some cases. You have exactly three values: this field can take on and that's exactly what they want in java.

A

You would simply write this field on the internet, but that's wrong because then at some point you could accidentally put three sentences in kitzscher and then everything is broken. Yes, there is actually work on a climb. I have now gone a bit far out of the window, but in some languages you would definitely not typify it so strongly another thing, so you have that somehow, like a tractor that represents the field we wanted sometimes now also to grab special cells of this field. What does he then transfer as an index?

A

How does he access it?.

C

Before that doesn't make any sense.

A

Exactly and I don't want to judge anyone- first thought: let's just take it somehow differently, why can't we do it with the install? It is so that you think what you first get programmed in the university that you just like that. An end user works yes, but there and also contains things that you don't think of us. We would like to know that we have a valid index, an index that for our 9th climb, lanxess good or just for a three times three.

A

So it's also nice to build a separate type for the index again, and this type now makes sure that internally only the things that belong there are in there as it is presented now, is not like that important can be represented with an integer, for example,, but you have to make sure that it is valid. All such things are quite idiomatic means we want to use the system and not always ramble around. If you already have such a strong type of system, then we want that too exploit and always so strong frequently used.

A

That means we really want to have.

C

B

Compiler errors, as.

A

Possible if we use something wrong, yes, I will show you a solution sometime in the next week or so. I would like to show you another thing that I have even more built in that has, however, with live cams to do, but I managed, for example, the light that doesn't give too much away anyway. I have.

C

A

That represents a valid move, and I know that the entry is a type is definitely valid, I.e. the field that this move represents, in any case empty. How exactly that works, and why at all, and why the compiler knows why the universe is we'll see when we had it easy it 's, really such a little trick. In any case, we want to have the best possible types.

A

C

My question: if I want to have an integer, for example,, there is between 13 and 42. There is a topic to represent that no.

A

Unfortunately, not yes, exactly right that has so that's difficult. There is definitely a toad that is somehow easy to create in bags. That is now certain intervals are what you actually want it to be a so-called dependent part system. That means a type system where you career definition that I would give now. Please probably not be correct. What I want to express. We can then specify types directly. For example, I want we don't have to have his ninja between two values and create his extra types for it,.

A

We can specify that directly in the type system, and then you have to somehow prove that the type you coined between the two values, , is something like that you want to have, but something like that depends on the computing load. It's a young language, but there are already ready if you absolutely want to read.

A

So if you know some types of theory and is that this is this sign here means you're, welcome to read through it, because it doesn't explain. What's suggested will want to take a break, is very popular, this you, but it will be difficult. I think I just ask too much from now on. Otherwise such a thing will still ask this is again possibly postponed over two weeks. I am quite happy most of you If. The edges have a task in the current phase, I.

A

Think that's good too, and here I also recommend solving it in a week, where you might not have that much time, sometimes in a week,, so you can move it to or to the next week,. Yes, now more questions.

A

Good then remember to answer us again so that by friday everything is fixed with your project and by friday, 1. Ok, that came from me yes and.

B

A

Have fun with the tasks and we'll see you on monday, when he's already with the project? Until then,.