Rust Programming Language Programmieren in Rust (Full lecture, German), 16 Jan 2017

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From YouTube: Programmieren in Rust (16.01.): Trait Objects, Drop und Smartpointer

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=8e21ce68-1029-42fd-974d-52dd05a7bb5e

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

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

A

Afternoon lecture the projects things are going well actually all answered by friday. That was very nice and we have already answered most of them. A few projects are already logged.

B

A

Are completely calls and now finished, you could theoretically states and some projects.

B

A

Answering but we will see also quite good, so it will already happen today that, with the answers for those who have not received an answer,, we will reveal a few details about the project on Wednesday,, in particular those who are now working a bit on Franz who are repurchasing, keep a.

B

A

B

As it is important to take a.

A

Look at it, for example, how we later minutes our few.

B

Tips in general.

A

There is still on wednesday, I will say a bit more about how your sketches are doing, can also often be the question how many readers have how much practice settel there is still. Unfortunately, I have to disappoint this lecture. We may have noticed it always happens on the fly. I did n't plan anything in advance. I have a rough plan, of course, what I still want to do, but I can't promise anything. That's why I won't say probably maybe what I can say in any case takes two weeks of lectures in any case, this week.

A

We will do some things next week. It will be all about mom trading, for example, and performance, and your trading miracle maybe will come very later. I would always say that it is so easy that is true. Then you would have two now different approaches either. I should have said start at the very beginning when you open the concert and we can't break anything, but then you would have gotten an error message every now and then you don't understand at all. That's why I chose the approach that I like better.

A

We learn first times everything so far. All many countries can understand with live tiles, then that we or who this week will probably also learn this week, and then the brave can understand completely so far so good, but exactly two weeks before this definitely need even better. Let's see if I have nothing more to tell now, no.

B

More lectures but.

A

There are still four weeks of lecture time anyway, I mean, since theoretically, we still have a lot of time. I could tell you, as I said,.

B

A

Will let you know, as soon as I know then know very briefly about the tasks or about the first task. The second task that is theoretically still being worked on by some of the.

B

First task.

A

Many people had a lot of fun with it I heard, who of you found out what the piece of code does? Ok, yes, that was indeed.

C

A

B

A

You had to deal with it for a very long time and I always find it very interesting. There are very few actually very primitive commands in a row and still it is extremely difficult for us to interpret his criticism. What exactly makes it so again, you always write the code for people not for the computer. If you write for a computer also applies. If it looks like that and then you don’t want to read it either. So the large resolution that’s a principle for numbers greater than 2,, I.e.

A

for the numbers 0 1, 0 and 1 is wrong, but otherwise it's correct off into everything that you here, the difficult part a lot more difficult. It's someone rough through you at the beginning. That's.

B

A

Or less just what always happens and that's exactly how we on the end, I think most people were able to hide that more or less quickly from the area of . What is important? It was important, for example, to recognize where all the arguments are coming in and where the return will come out. You had to have looked at this one slide where it is, then there are some optimizations in the x86 64 instruction set,, namely that the first six arguments will be transferred to registers,.

A

B

A

Be transferred, so in er de this input number is the return value. We always returned the rx. Our questions have now we go back well, but actually always only spoken of 64 bit number registers. You have to realize that boule is then. If 40 is zero, then its better said and everything else stands for shoes. You actually always get one do everything that was somehow the.

B

A

It there was still some confusion because there were always these 32-bit registers that were addressed, and you do n't know exactly why the lower 32 bits are now set to zero,. The upper ones are already 0 or what happens to them? You could more or less ignore them for the time being and I think the most difficult thing was this instruction.

A

You can already guess the parts somehow, but that's just one if he suspects, you might come up with that. Okay, we've had that before. If you take an arithmetic operation, a burned then takes the second opera accumulator. Then that happens actual case. In fact, in erics the patient is saved by the two numbers, but that does more.

C

A

Saves the rest of the division in rdx this installation, you might wonder why is actually rdx used and before that he opens the rics again set to zero. Then you can set it back to actually. This only runs through once or always jumps or something else. So it's kind of obvious. It's not obvious where the dx is filled with a meaningful value at all, and there was also the idea that you between test rdx and looks down to earth. What of these three instructions could then possibly have any influence on sex, and that was then.

A

Yes, it has become a bit more important than I had thought. So, as I said some of its quite long, then I saw it and also many and I got everything analyzed completely, but then you at least noticed how difficult it actually is. I thought at first I might give something else that is easy using my cell phone, but I thought I'd just give out a shipment by the way interesting. Maybe what kind of thing.

A

A code that generated what you think, I wrote in a code.

B

D

The mast that is exactly the same as.

A

B

A

Mean is not optimized, because the sandy code does.

A

N’T do anything with the root either ends runs, although the buses would be sufficient.

A

B

A

Exactly the typical example that I have shown at meter before.

A

That more and more people like it so much because it is extremely short back that is now simply 2.

A

So these are the possible tyler outnumbered, and so we also look for everyone that the divider applies, that the possible tyler just doesn't have a fixed smile that he just doesn't have a part as such and, as I said, our cook gets by with optimization, and if you remember back again what that without so, you can think about it and make optimization. We somehow have a range here that is an object.

A

Instructors is created because the next method is then always called theoretically, and this is now another method that cleverly takes such a complicated object like we know we can also get rid of the optimization spot once in a while.

A

It's not really that crucial and really draws, because with optimization flex in the extreme, a lot is developed, where we definitely see that even in our methods are here. In any case,.

B

A

All there are many more methods: here,, you can see them, for example,. Something is from a range so that a range can be established, and so it somehow happened and the optimizer manages that everything is compressed into the representation that we saw where we think I all somehow to make sure that pretty much, never what you can write. So maybe you could squeeze out another one. Was instructions and write it out after mushrooms, but not much is happening now.

B

So these quite.

A

Primitive continent works, I wrote, yes, is yes, also, okay, if he always optimizes, no matter what code you write, but also high level code, always because almost the best center generates. That is somehow something that you first have to understand. In order to then be quite free when programming and just look around the real thing doesn't have to make him think,, but I use the nordschleife in Nieder Florstadt,. It's definitely slower,, that's exactly what you don't have to do when resting, so enough of that,. We want to devote ourselves to the new topics,.

A

It's about various things and somehow the last one week needed because low level stuff, you will look at least that helps with most things his understanding a little bit like that. Let's start.

A

Works here, okay, I managed it. Actually, we start today. I really need.

C

A

Topic but I have to do that briefly. First of all, say there is the rest. We know the reference types so somehow new york, if it often and a youtuber rapper cee. These are also just very simple pointers for the machine, so 64 bit wide with almost 1 system and they point to something. But we I also know.

C

A

There are guarantees, for example, such limits always point to a valid object of type t,, which means that I can somehow also show unrealized memory.

A

That can be something that I can also show another object that doesn't even have a type t or otherwise what that is always great things about it and, of course, we also know that there can only be one of this youtuber reference at the same time, it helps us a lot and we actually always want to use it, but there is also a rast because it can do everything should what also, for example, c, can also be so-called rov further away so written now, you look at the art again to leave extra statistics behind.

A

These are also the corresponding pointers for these, and they have no guarantee at all. That means they could point to absolute rubbish like, for example, even then no.

C

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At all and they are, however, when, ultimately when we have to do certain things and in particular, walls have to interact with c, because these guarantees don't count because we can't give these guarantees, we sometimes have to tell her to continue using them or if we have very low level sickness ourselves with her computer. We also have to take care of these rough. He first plans and then go to the outside references, so we can sort of.

C

A

A robot and make sure that the compiler doesn't understand it is always valid, but we have to pay attention to that ourselves and then to the outside go out some reference. So we cast this friend of the reference and say: don't worry compiler. We are sure the pointer is ok. That means references and just welcome to the example. Something like that. We.

C

Just increase some number.

A

Now in hexadecimal and say that is now a pointer to 0 32, we could also say that there is still 3000 string. We could also say that you don't go at all with the pointer on the motto of course, and.

A

We can do this here without fear, but if we want to distance the pointer, what you think bet that it all.

B

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Automatically, if we want to explicitly differentiate friends, so we want to look behind it, then we need save. Then, as I said, the contact of course point somewhere. That means any access to the save funded by this friday is highly insecure. So we have to be.

B

Sure for yourself.

A

That we are not doing anything wrong, and that is yet another example of the fact that we are doing something wrong. That there is a very high probability that the program will somehow crash. Because behind this.

C

B

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No valid and 32 very likely the to out are outside of the memory area that we can address as precisely- and that said again you who could actually never use that, I will only use this lecture for you, because we want to look at a few things lola. We want to understand a bit how the internet works. I at.

B

A

I thought you can do it with references, but that's a bit too fiddly so down. If you massage them, they 're kinda, stupid, add without guarantees like that and then there's a special robot against those who have already programmed as c or c++ openly. They know what that means,, namely a friend on something that doesn't mean that we internet friends, expect a valid instance of the type far it won't make any sense either. We just say that's an address for something we don't even know the type right now. Yes,.

C

So that these friends and.

A

Guys behind where we say: okay, they don't point much to that and that with this friend it.

C

A

That's just saved that I really don't know anything was there and sometimes you have to do that and now we're really going to do it first, but I think this year was an example to show you and then we'll see that kinross looks like there.

E

Were we remember.

A

Thinks that interfaces are a bit like the rust trades and his de mail interface and now have two classes that implement the interface like that and would do that now would have to write an example of a method that something comes in from the user and, depending on what has been stated: otherwise, either one and you return your cat and then we can somehow say: okay, it is one with dogs, us from the user, and then we call speak up at this end because we know that there is a very open angel and the kospi found that works for years to come, I've tried to set 11 relief, certain trades,, no problem,.

A

We have two guys who implement this and, of course, this stupid formatting, but I thought only you can be great, and now we want a method and a function better said that also does pretty much the same thing. He neither a cat and I can also enjoy that, but maybe we've already here's some kind of guy if it's never the name of a trade used as type. What is that? Actually, this code will not work yet.

A

It says end is not that means, and that is to understand, to find out afterwards how we can implement that now we have to go down a bit deeper and then again come up later to understand what exactly happened. We talk as the first monograph station. It's a great term that you mostly hear in connection with c++, but actually mostly in connection with rast, and you can see what's happening here. We have a generic method that sticks to a turn and since stick calls twice very tensely and now.

B

A

And a cat and call each of these methods once for both animals, so.

B

The question is what is actually generated.

A

In the sample code today guess divisions.

A

A

E

Already know is due, as has is he determined so the goblins would just make it is. He knows two different versions of this function very.

A

Well, two versions are generated and in this world, so the two versions will probably be pretty much the same. It is in the report. It could only ever be about one method, and if you call up the two here, then we go there directly. The address of the two, even smaller hint here that are always also with this tool online such great names that are somehow already brewing, moderately select the actual names by the binary file, for example. They are reported.

A

That means that all these characters,, such as the angle brackets and all other things,, will be or colons,, even if you have them, immediately, will somehow be implemented because we cannot use a colon symbol.. There are only very few characters that we have both in the Baltic Sea Railway files, and that's why such things as colons are encoded differently. So it's usually very, very unpalatable. If you somehow always see such a funny sequence of numbers and letters and then in between times like this mail or speed circle or something else, that's funny.

A

That is then somehow the name for known methods. That is also well understood by computers, but usually it is just as difficult to display back to the actual topic. As I said, two visions arise and that one can look at these mono physical, the created for each installation of this generic method or function, a vision to the sampling as a special relationship prototype. Of course, if he calls there twice, only one reaction is shown.

A

That's also called static dispatch, static display because, as I said, we specify a fixed value for call. So for us the mobile phone is natural, the method name, but the sampler can then, of course, use the direct address of this method. So it's a fixed value later. If the static display changes that 's no problem, we wo n't have to calculate it. We know exactly where to jump because of this function. Width. It is known that there are now some disadvantages.

A

If you can simply think about it,, a lot of code can result if we always use many methods that you can use many different types, because now many different methods are generated in the smp must be very large. Yes, that is.

C

A

Problem that also makes it like that, as some of the few known languages, it is always what she created for her type and that sometimes leads to sexy virtual ones becoming big. That is a practice, hardly a problem, mostly we program somehow for our for our notebooks or that which is not for beta systems, for example, or 604 in rasberg. That's actually not that important to us whether directly on youtube play a 10 megabyte large. It can happen.

A

Sometimes it just ca n't be avoided, but it still brings it somehow, as we will see on the next episode exactly and that another problem is, the guy here has to be sick as much time as that's what we bit us on the previous slide, because my guy knew there or chain not too complicated, be part of the user. That's why we ca n't use this applied. If the user can decide that, we have to think of something else somehow, but first of all.

B

The advantages.

A

Of mono morrissey, the static of the patch is much faster than dynamic. Dispatch will be in the next week.

A

If you talk about performance, even more data to go, but I have ever believed that it is in any case much faster to have a fixed value than if you somehow have a value that is loaded from the register or from the memory and especially possible that there is much more optimization to come, because if now somehow your integration is, then the container can direct the right construction of the packs instead of having to somehow treat the type each time as if something odd is necessary, and especially is too another optimization office in meiningen possible in eining is probably one of the most important ones in terms of currency, and that describes the requirement that the compiler copies the functions,, I.e.

A

the body of the function,, to the calling point.. This saves us various says,, for example, the use of the deck for parameter, transfer or parameter transfer in general. Don't have to push our way further and all this junk is what we saw last week and we do n't play at another place in memory. Was the function is stored, but we all keep everything local. That means a lot for us in terms of performance and optimizing the time or many optimizers in a very aggressive way,.

A

That means you will always get large blocks on the line,, which in rare cases is usually bad,, especially what executive again, if I have any function, have you ten papers in several places, then that's bigger, but it's just a lot faster because of that right, away,, for example, the age and I should just say that it's very, very important, and that's actually already said if we know what is a in western canada directly the right one to install so first example.

A

Here we have a generic method that somehow takes the result and spits it out again and it acts on itself, and that is now also a copy. Then it is easy for us to make the new ones parameters. Note the go back with yourself, not particularly exciting. I will write about.

C

A

Now in laim, never you sometimes have to do that. If you want to look at various things in smd and don't want the compiler to always see the inland because then you don't see.

C

This function at all.

B

A

We can have the same thing displayed functions that are now called from.

B

A

Function where we somehow have two input parameters, two output parameters once with 64 and 64, so once normal, then floating point, and that has to be on now.

A

I can already do that think about what that is generated bigger.

A

So we see here there are 102 times here here and here in the original name, this strange known name. There would also somehow still be recognizable that the name is different, but, as it now shows here in the names just completely the same, but they are called something different. So what makes the calculation against the lti + rd now probably no earth edict until the first argument, our function and this teacher and trick- and in any case he saves the result- packs where he should get the result out.

A

Somehow that this is actually done in the function is an instruction not bad down. Here we did something funny ssd and then x0 that our things for floating point and later other extended instruction sets of processors. That's somehow not very easy. The important thing is up in any case,. If you look at this strong google,, it comes out somehow that's an addition for floating full numbers. The compiler can add, the processor can add klooz directly,. That's why I'll use that too,. Otherwise it's much too imprecise.

A

This floss here too, is just a single station instruction to see the actual buddy of the function. Yes, and of course, that still has to be looked at closely in any case,. This eleven will be deployed here once twice here,, which will definitely stop again.

A

Two highly specialized ships are generated for these two installation methods faster than an instruction one can badly and what would happen if we did n't know at all that, what's behind it, if it weren't generated for each individual, then the compiler of the processes could just know well, somehow there is a method that I can call, so it would be in here somehow the body after another method call to call up this app when we do this add trade.

A

He has this method that actually adds that, yes, exactly but here in the amount of two highly specialized methods- and you can do it faster- that's the advantage of one can optimize for everything highly specifically. If we now briefly remove it in a teacher.

A

Then we can see that all these instructions and all these operations that were made within this method have somehow been reduced to the greatest possible extent.

A

This floating point addition is made and the other addition is carried out and that we then just look at the output is then saved, so we found it around. Eleven is no longer there. It was simply copied in there and you can see here it was n't just copied for that reason, but then what comes out of it was somehow optimized together, so that you can summarize it again if possible,, that's, why it's pretty good in one, and sometimes you do n't want to pass it on now, I just want.

A

We want to look at the smi for that. It's in a letter, so do so. We can maybe say it is usually much faster and notices that there is always room, for example, c++, and what's going on, you drive it pretty fast. What can I tell you now? It's pretty fast, the wanders and something like java, for example. Not so you can always do a bit more. Maybe it's because of the savings from such experience.

A

Slowly now we have first of all. How can we finally do the opposite, namely dynamic dispatch that our goal now is that my function have the right implementation of at runtime speak calls and normal. We don't know the type at the compiled time,. That means we somehow have to get a type that implements the speed and we have to call a real function for it and from now on, we still use different fields that contain other fields that these types don't have are empty there.

A

It can sometimes be a bit of a brainstorming whether you then have any idea what you need. We won't say a finished one, but some idea that you can manage it.

E

So you probably would n't then, that two direct also no place for the first time at the.

A

Big regatta for that completely on trading, do you mean that is exactly every.

E

End of march would give, because we are not quite objectively.

C

E

In louis, his function itself as the whole now in your case would be our function friend or man about the possibilities. Also too.

A

Much right is we could, but we need it. So maybe if he says his name somehow loudly or something like that, he would like to be there more so that somehow has to be worked there that he needs to look at. So we just need a friend would have either on the instance of the dog points or to the instance of the.

E

Cat function to say the address, whatever may lie behind, say exactly.

A

So decide not yet.

E

A

Just writing a sword results in 0.

B

A

More or less it is also not quite right for our purposes right now. Look we now have an implementation of somehow speak for the cats are now stored somewhere. So the handling of these two functions is stored, but I think you already had the right feeling for it are still putting this implementation. So exactly the.

B

A

Somehow we want to hand over the function, father to the implementations now internet. Your aspect knows roughly how we would imagine that first function party. We know that it is something like a function panther and it is a typical faction center. That means, although all functions are still the same, somehow an fn still in which parameters are passed in which return value is actually, I have to know, but basically.

B

A

Pointers all see like point that in any.

C

A

Function, one as its friend to a function that a robot takes on something, and then we need also the pointer to the actual data. So then, somewhere there is an instance and memory that and the dog is called now somehow. You have to have a pointer there too, so that we can also access this string.

A

And what you are doing now is that we continue to call the situation, the function to which the pointer shows the eu with this data, which is to the actual end after here again somehow a friend on something so that we don't define it as abstract as possible, because we can't say it's going to sell or eat now Yes,, you can call them and it would then be very complicated, like he gave us a job and then say: inflation rate,, which we want to go over.

A

It's, similar to meditation from there for the b, the quote not in me, and then there was only one for the normal friend on our there than on our instance. So we do it somehow, like that. We have a second instance from the dog and we, my friend on the implementation of speed, and that can now handed it over. That looks very nice at first says: I'm definitely in programming. Now, that's just the theory behind it. Then I have to think about it.

A

Somehow, how does it even work and we're not quite at the end yet then we now have a method had a total rate and we were maybe several and that the solution and I’ll just tell you now that you look at it so that when the so-called vita and then cvp th, this is a table where all virtual functions are recorded. Virtual functions are mainly guest, tells that plus falls what we virtually keyword gives for functions that are somehow overloaded. So they are somehow like functions that you call dynamically times.

A

Is it just stores all functions like table and has to be created again, prototype cat benefited from the offer with two methods and then have we create these like table the compiler for us by the way. But what remains is where somehow two functions for each method once existed, and now we have to create a whole dog, for example, this like table for a new one that is constantly like table of the festival, statically alternated.

A

It is created again or used once and therefore now the way the dog works, with all the chaos and special and for all types that implement and call up, we would then, or sometime, fall back into our implementation. It weighs points the look, so we would always these 11 more will also come like table des engels and.

B

C

Can call it like.

B

This with very funny sunday places.

A

The importance of operators plays a role. If we have the function pointer in a tract, then we still have to make left brackets until nothing at noon and is exactly this. The top manta the profile is still. This is just this herb that shows from 11 that holds what you get over okay as far as too ugly, we know how it really works, because that would be ugly always had to do it. That way would even have to start with a treadmill and it starts.

A

There is a so-called trade center now a reference to a traders such as, for example, completely to a then it is a so-called trade object, and these top 6 are represented by two counters, not even the pointer and once friends on the actual data.

A

That means friend- and I think I've heard that before that's the same as in this series, friends also a that means st. That means we can now do that. We say something gives before its references end we have to in the oldest trade. There can again be something like pressure on medium and now our cat.

B

A

It on and somehow say, I want someone to give an object from the cat. Now have this cat I'll put it in the big details. Are these lines? So of course it's just for the sake of brevity now we can also go directly to the beatrice, then somehow be euro. My cat do what is happening now in the background we have our sticks.

A

There first put this cat on it with the appropriate number of wines, and then we have this trade object, animal the top 6, as you say, through two big things, because two of the ridge.

C

A

Show the state annually on the instance of the cat, if that weren't now, if it were normal for franz, that would be.

B

Quite normal, so will be that's a reference.

A

To zurück works like before also just points to that. Another interesting thing.

B

A

Currently, on the table: first again, the section in the executive around the table will probably be preventing.

A

B

A

Already exactly how to do the action, our expert and as well as table where then for all the methods we just we have saved. Our range of functions is like pda time on it and the function point will show the doctor, which action does someone have to take.

A

D

A

Text exactly- and here we point to the relevant information.

A

This is what it looks like in the background, and this is how he can cdu, then also at runtime. If it only gets.

B

These two compartments.

A

Like interactive splash,.

C

D

Run like this, the bi pk doesn't show directly in the text. If.

A

We have several methods, we would have to be the pa colors and the size of the top 6 for each method. So this one difference at the end of march, for example, a helper will rise. The whole implementation can speak and cathleen are not in a row. We need one pointer per function: optimized the.

D

A

B

The question I.

A

Had n't gone deep that you can dewitte the virtualization, that is also an important topic in a band. Optimization is especially with such things, the plus, or always has to be proven that actually, this method was not overwritten again and it can not be that the path of the patch people, so that really is a lot of research, because not at all, not that we won't get enough of it. But theoretically you could optimize a few things, ok and by the way, if he only writes this trade, then it's another means.

A

That's the error message at the very beginning. That means somehow we can't get going use.

A

Is actually the like tablet, also a little bit more complicated light world again very briefly, I would show you that, although it is not so very important, the vital one contains, namely for still own trade, a couple of fields, namely three additional instructors and two others. The have not yet been used, but it is better to think ahead and look at the plan for the future.

A

Maybe they will still be used and it is very likely that the two will be used in any case, then, for our trade, these five laugh gut, store director will come shortly and exactly then the nervousness it generates, as said an installation, but as per trade, so there in front of one or dsl and kate change it. If there also do n't know the trade friend would implement, there would also be another with lever sitting next to donkers foreign in the book complete documentation on this.

A

If you can take a closer look at it and we'll come now, I wo n't do the race in great detail,, but if it's a bit very precise.

B

A

Have our trade, you then the pressure, then the implementation leads there has the we don't have a cat exactly? Who here speak to raise and brought in what somehow calls that once and we.

B

See we because.

A

A

We see many things here that are not known to us, but prove the implementation of dsl speed. Here we see the implementation of doc here they.

B

Both don't do anything else.

A

As you can see, but we're always then there's how we're not being criticized that much right now and now it's going to get interesting here is a section line and table 2, and there is now data entered directly,, for example, drop. That is a functional width at the top. We do n't see exactly that.

A

It's on the top the structure, then there's always one in here, because somehow the size of those there with eight legs, just a band and then the actual things, our thing and so on, come with the functional friendship that is then packed by the center center in the dot data section, by the way,. If you've seen that, if you haven't exhibited these things, for example,, then there's still a lot more to do.

A

If it's something that's still with what playground is displayed when you click on it all this stuff is not so instructions for the sampler that you say where all the things belong. Please, nice, not even anymore and as well as table.

A

How can you actually always hide, but there is a bit more information about it dealer to say where it is. So these things executable spots, yes, but interesting- is definitely.

C

A

How table the saxon is packed and that this like table is also used somewhere.

A

So the compiler optimizes, a lot of exactly that's even pretty good here right here, sees one that in the first. That is where the second argument is passed to the function that the table pointer is more or less packed and that, with the first value, a reference to the instance of the dog is packed in that somehow lives there. Now you can maybe.

B

A

At home, look at it in detail euro. In any case, it's the way it was told so that we now definitely know we can use these shade objects with their disabled, weird magic, which we now understand at least halfway, and that would also happen with java and now, by the way, were that another practical thing can return. The right trade object reminds us of the push function expired.

A

What if we do it like this? We give back a small one and say here somehow he then takes the cat and reference. What do you think happens.

E

For a long time still alive.

A

That somehow doesn't live long enough. The dog and candles is dancing. Of course they don't live that long, the function of living. That's why there's a way out there? Maybe even someone has a solution: I 'll, let the others think about the box for a moment.

A

E

A

Particular everyone. We know that too, to quickly go to a box with others that is a bit down for what this fear means. There are tips that you can also use it. For example, position like here the box works now, because the friend in the box is then also a representative, but how always point to the blow, and then you can simply say all these dogs and cats pack like a box and can give it back again that works, because we go back to the signature on the box.

A

That means the box always somehow keeps things and on the fortress, somehow Doesn't she release it. Or does she lose me an example that just occurred to me, like a little child, holding a helium balloon and giving the child around in the round somehow about Mama, Theater or something? And luckily the child ca n't, let go they're all that always stays that can be passed around do n't know if this analogy is good, but I hate the.

A

Top 6 always live behind bars because the actual things behind them are just to the travels and there you can combine a different size are somehow one he saved his name there or whatever. It is now somehow is more than somehow a v8 that the failures are saved so can't know how big it actually is behind that. We all know that, always on the go of course, deep allocation is learned again, not so good, but that's really difficult. You can.

A

Save that is sometimes difficult on the stick. I mean we've seen.

B

A

Increase or rather lower Saturday further theoretically, we could also use a variable than one at to decrease. So, theoretically, we could share certificate, have on the stick, but that makes a lot of other things more difficult and because it's just so difficult, it's not possible at first point so far, not yet that's why a little language is only made mostly the deck or a stack frame is constant course.

A

If you really want to avoid the hyper location- and you only have a finite number of options like here- where we only have cats and there and not something is mmn- could finance what it could come from another world.

A

You can, of course, also tinker with them where you now in the two options, everyone has cat or dog or several.

C

A

Joe jackson, now some limitations, not only are they probably slower, as I indicated before, but they also have some other limitations, e.g. I imagine that so that brought don't imagine, there's already a clown trade, but just imagine that we'd want to leave it as a trade object, so said happens here at all. Does that exactly do that? I can also show that we put objects in then give in hectares, and the clown is profitable. Exactly what Do you.

C

Think this line is happening. Here,.

A

What should be there if I could wish for.

D

It to be called again, generated rewards. Then it is bound to this memory area,, but then it goes out of the scope,, which means that it is destroyed again afterwards,. That may be imagined.

A

D

A

Way Of course it's destroyed again in the end, but that doesn't really happen either as we can jump to the clown implementation, but.

B

A

Has which is actually that's a reminder to me again that will be done again now: it's cheap, so there's another installation or just a login assembly in there for this function that's a close match, so the guy fox influenced, of course. Now the deck friend found the whole function. If I'm somehow a rector, then it's exactly 24 big. The deck work has to be that big in the drunk, but Of course there are others too,, for example. Does the example also lure the internet implemented claws? Then it's nothing, but just a far big.

A

How big was this stack frame? It comes down to it. It doesn't mean that you can't trade such trade centers at all objects. We do n't do so-called if they are objective. However, some rules don't even want to touch briefly, so slips the condition of all methods.

A

Objects are definition, follows and that the straight doesn't require that it means that it just means that the manual the manual lever for the also to tell programmers I do n't want this trader is object, is used a dead, now object safe if either it requires that here will that here it's the other way around. So a method is objective. Is that requires? That means just what? How much that trail of dead? You can witness two, but you ca, n't use this method over there.

A

You say that explicitly or most fans is the mitosis must fulfill the following. The method must not have any type parameters must have a receiver argument, I.e. a sales argument and may nothing big opponent use 11 in your methods. Signature now have already seen here clown written.

A

There is supposed to tell, but in the dynamic context like here, you can know what the big increase is that eleven you can't somehow get him out of such a trade on jack, therefore find out what kind of actual type is behind it and somehow adjust the corresponding stretch frame or something that would be too nice that just doesn't work at all the parameters as well.

A

We only have one function, width on one function, the function street parameters would have led to step in for you again and we had several Installing the function and SMS costs.

B

A

Your one function further that.

B

A

N't work either, that the receiver argument. He gave it a bit of thought yesterday. I think it's also possible without first classically, still being kept. That way that you need more aggressive eyes for a long time, I mean, but it's probably working withdraw. It is done a bit differently than that. With the vw pta and the vitale works there, you don’t need an argument.

A

Yes, I think I will continue. These three restrictions are.

A

D

Hope why the method or why does the method itself have to be used that just doesn’t work that she, the 2 so.

A

That's just that's over the gate. That's just the manual evaluation programmer. If I somehow have a trade which I now sometimes want as trade objectives, but I would also like to have a method on this trade that became self spices, for example, a method with parameters I would like to have both of both apply somehow so I say in my method with parameters. I demand that this is the case and to say, if you make this a trade object, then this method thought me. That means tried that this method, by already pack the retail.

D

But then you do it dynamically.

D

A

Exactly or you can't even call up dynamic, plain text with this method, so we say almost everyone with us. If we write all engines normal say we also use all led trade objects, but if some of them I go, would the compiler first say I ca n't turn this trade into an object and then say we honor this method. If you don't use it in the dynamic context, everyone said: ok, the remaining methods are fine. I can get out.

D

A

There are various reasons for the first time too manual way out for the programmer and to say this trades definitely not be made an object, but we can also consider that the self is taken at value we can take. That is inscribed 11 at value and when taken at value, it must also omit that no more reference more lowercase individual, but it must also stretch sec fit than being able to be handed over on the check, then.

D

It would have to be that means, then exactly and.

A

D

His country is nothing itself or is there not.

A

Required by the municipality, that means so wait, I change the electoral law. That's why we can ask for this ourselves to write down such arguments and such methods, the self, without a club name but at berlin. That allows us to do that. But then we can't do it all the time. Then we had to put the dynamic context of the size of bush into the tent again know and is extremely adaptable.

D

Are you sure that you can't help yourself, then the question mark is pretty sure not.

C

A

D

Because it doesn't get clear to me from this right here, I'm asking yes that doesn't mean that the size is more important right now. It says there.

A

But the monastery.

C

D

Is not itself may also be fear or.

C

D

C

D

Be ok, I know that.

B

C

A

Most of the time, not that not so much, but the rules are somehow right have been written off, pretty precisely underground showed a documentation which, of course, can also be done with it like this and another restriction. If we now want to have decided objects upgrades assuming we want to somehow take something that is angelic, but also oriented, then you can basically do it like.

C

This from the syntax, you.

A

Cling to, but it doesn't work like that syntax correct, but it doesn't go to the computer two dpa. That means you need two on one like table, whether somehow the dynamic functions for both trades are in there. We have the implementing type that was theoretically possible, but then the friends would have trade on 6, again small size to compile time.

A

You really can, because we now have any number like pda s behind it or you build a common like table where all the methods of animal and briten are on that you can manage by doing it with your own tracing. That sort of of the other two points. It's all very complicated. What I'm talking about here, but link to that demonstrated how we can do it. It 's, definitely not possible. He can usually have a decision about a trade but that the are already there. There must be some reason why the sandwiches exist.

A

Okay, I forgot, but that works here you can.

A

See special trades as dynamic. That means we can say 110 percent. They don't even know them or are two special ones: marca trades that don't really have any methods already built into the language itself and how.

C

Can you use.

A

Them because they don't need any other areas, and we can also easily use them here that we'll see later,.

A

That means that there's almost no way you can not two real trades built in one trade object, but got say these two on the way use both in marca trails and we can use with us. You rarely see such an overview so.

B

We have this wise night.

A

Dispatch static display looks like this.

B

A

Write that always, as we know it say somehow, a guy next to me and the implemented trade, and that with the dynamics of the patch is just as out is a trend take optics with the static display that solved with my obsession. That means for your placement with a tip becomes a special functional body is generated, and here it is solved by a like tape, and sometimes you also have the term parts racer. The age only means as much as they still completely also change the cat.

A

Now, absolutely all references from the end of may, so we deleted the real type of the cat. That's also quite interesting peters also, because some, where asked about that also does hectic, is in almost all cases, much faster,, for example, due to all the optimization that is made possible and also- and you have more options simply because your shape actually suits the type,, for example, to return self, which is not possible with dynamic, plain text.

A

The dynamic of the patch is almost always slower and the concrete type that is an advantage, but does not have to be known to score currently something good for, e.g. the example at the beginning or user can enter in and you your cat is like that. We have little in rast. We almost always have constant dispatch up until now, we have only ever used that and if we can, we can continue to use it. That is also faster and there are more options.

A

In most cases, dynamik special is usually used in another language, such as e.g, but you can already think that dynamic suspension is always used,, I.e. the compiler always jumps to some dynamic address. Kvasiny gets the bear out. So if you run it for years, it will almost never jump to a fixed address in the whole year, much more complicated, we'll get there. We will go into more detail on this in hesse. Week.

A

dj wm from java is extremely complex and does a lot of weird things that we will then understand,, but normally I wouldn't be in the mood for weird things: either,, it's going to be dynamic. Dispatch soon and that's another reason why other languages are maybe slower and now an overview of the number of stripes that we have heard more often now, but first conclude because they are also called dana.

A

Miceli is called times or des lows for short, and there are basically only two pictures in the sts das once the meat is written, so somehow clear, a type sts from a kind read one swings objects are the only ones that are formed and we can also build our own dsds by building some strapped or something similar and since the last field, as afraid, for example, is it that easy to be?

A

That's roughly defined like that? It's not defined like that, but it could be defined like that that 's just one thing live. That means we can define it that way and that's allowed to mean and leads to that all the rules apply to that as to the others as hot guys and.

C

A

As the landfill in which you just make a youtube and in there does 1 makes so you have the difference on that, does me have already seen it his girlfriend. That means we have the normal one today on the data, but we still need a bit more data and to really complete this guy knows what to do with it read it's always the length of the slice and with trade objects.

A

It's always the pointer on the vita is curious, so the international closure of styles and now also know roughly how his register works,, which we will no longer need,. So far, there are questions, okay, I'll. Do it anyway, namely,?

A

There is a trade you can do.

B

In many places.

A

So that the straight draw can.

B

A

Organically, it's defined like that,, so it's very,, very simple. It's just a method that gets a reference from a youtuber and that should somehow destroy types. Tells that means that the structure and this drop dead is called for each leg that comes out of the fabric. That's the joke. It would be with ci+ works, c++ the structures always an own cost, also in c++,, but also, if you have our cat denied again, for example,.

A

Then it will work and if we now show our cities that too, only issue a cat instance, create a constancy. What do you think what comes out as.

C

A

No one came up with the idea.

A

C

D

A

Exactly but first with the normal boy performed and then all the variables out of the dust, output and flew job is like I said to the effort. That means there can be many do things we will see on wednesday why this job is very, very important to peter, but, for example, it will still be to cry or to choose freely or to close network connections roda close files any such things. It all makes sense like that, even when working at the end, you cannot call this method manually.

A

The special feature of the compound ensures that klopp is only called once at most,, I.e. if we somehow have a cat call as a drop on the error, explicit error, something like you, ca, n't call, klopp or anything like that. So very much for the method. We ca n't make out a great function that you can't just write yourself, a job that you can just write up to now how this drop function is defined.

E

That's an evolution just.

A

Right so this would be the function rooms, death, ladies moravian, but some type d, but then it doesn't matter anymore. What do you have? This team is purely appointed to the function? Then the scope of the function is at the end of tea. Is dropped immediately, got the fusion and your gives after this little foot louder figured it out last time. How is that not so? No one can guarantee that the job will always be called, but it will almost always be.

A

So you have to make an effort, a little anecdote, so we 'll see later you can do it with so-called smart continue to build such a reference circle so that you can do it with safe code. That something is not topped constantly remains in memory, because some references always remain alive. The raster developers somehow noticed a month before the release of 1.0 that you connected with another feature. The library can also manage it. You can also access unrealized memory catastrophe.

A

You can imagine if you are really speechless, bring the promises that never has any memory problems and a month before com browser war on that can be managed or problems was kinda stupid. She decided to do it like that saying: okay, it's just like that. We can't always guarantee what you'll be called on it by the way c++ can't guarantee it either ++ can you recycle such we just have to admit we can guarantee knowing and so we're not saying that not calling out job anxiety is saying that it's safe.

A

We can't prevent this other way of partying. That was exploited with these. Not rude calls and that's why everything is safe. Again, nice leprosy sufferers, but at least looks there with it decided not to forget this function so to remove the tent from this function. Previously, here before cap fund was marked, save and now it is no longer attached to the jacket function, does exactly what it says are worth at some point: the ownership in front gardens.

A

Where will never be a job, call that you shouldn't do three rules. I do n't know why you wanted to do it unless you somehow talk to c or something like that, but it's just not even the number of these reasons due to mutations of four gates.

A

There is also something about it, so almost guaranteed completely sure that memory security we talk about all the time, but it cant guarantee that job will always be called, but it is still so sure that, for example, the river water will be security says we guarantee that the district will be called so ultimately could always of it assume that the restructured company shouldn't let highly critical things rest on it. That's just not enough of it. We're assuming that it'll be exactly once in mexico and variable look at what order this job happens at all.

A

We build a nice type of eco drop. That has a character, so we can identify that, and that gives it out with character if it is believed what, if we have this, so there would be two things given out now also drop djb. The question is just in which order? What appreciates the answer? Why.

D

We only then need it issued. How can you now own and then I? Would yes, if I break it, so to speak, break b's defense, for example, in the block, been defeated again for something that's why people us is now rebuilding.

A

Then the right Mr. b, but it could happen if you first think it could use invalid friends only with the way is also afterwards. That's what I just said: okay, now, let's take a look at this, otherwise I can also think about it.

A

It will be so. We have the eco job here up there that here as interesting things,, which we probably put out there.

A

Exactly against the cebit, of course,, first of all, it is believed that in the innermost scope is we think about a few other things,, for example. If he says job here as this function of grade imagine b now then b is jobbed. First, even before c is created exactly what we can do is that we somehow an ode to that, doesn't see pt and return button again.

A

Does n't really do anything, because we don't really know why it is nicer and always gives something out, but ultimately vips only stays once and nothing happens at value. But what? If we say now b what happens now.

A

C

D

A

D

A

It dropped in exactly night in the park exactly because the result of this part towards the end like that placed last object. Nations given that is a hot potato that we want to have again. Finally, after the chip, but nobody can get the distribution, then nothing is bound. That means it should be done again. First, if we, but that wieland like tree then happens quasi. Nothing at all so like before. That is already true, is issued as pretty much at the end.

A

That is the important thing again if the ownership is handed over to something not hit now. Remember the child. Yes, that doesn’t let go of the helium balloon either that hopefully, will never be jobbed, but you know what I mean here. You can somehow hand over, and it is not believed in between that. The important thing is, for example,, with the vector,, the very, very large vector, was constantly fired,. Who of course, now also manages the entire year, and you can imagine if the job will be.

A

The rektor gives this hit anhydrous so that there is no save league, but if you call back and forth from the vector,, you basically only have to keep these pointers and the discounters for the length and the capacity of the rektor, the back and forth have the actual data always at the same place in there and never get a job in between.

A

So it doesn't take a lot of time to let go of it to hand over yes exactly back here.

A

I just said that then not much time left it anyway, so we don't waste so much time and fine people. The next topic is smart centers and they are very much based on drop. That means we will have heard that just now need to happen.

A

First, that that's what the sck and that's just an address to the right body, sort of like them pipeline tap trust. They are just another address from pointing out whether economists not that's why? Yes, it's.

C

A

Of just an address we'll get together. If we have nice sc here we can talk on the chip 4, your for an inter and that we then, as pointer. That can say yes do, n't write any further there 3, also here the and with that we have already described our beautiful book a pity but forgot to release.

C

A

We somehow put these four white, which in this case was not bad at all. That was the operating system comes after that, anyway, up because the people are over, but you can imagine it's easy to forget how many functions the application contains and then what you don't forget to release will start up the winter doesn't matter. It's just an address that sits on the way. Then it's gone.

A

What's going on.

B

A

Are just pointers so almost even further, but the find I behavior is what is shown. For example, when we first look at the box again. I've already briefly mentioned that practice a so-called after further. That means box.

A

Is that also a brand on which we are now putting some storage area for four and data we only put in three and when this box is placed at the end of the course it is believed, and the box releases the storage for the child, the means the power, so this one comes does exactly the same thing again upstairs or even more so upstairs would never have forgotten.

A

That is the simplest smartphone I can imagine for exactly one month and it kindly deletes as soon as science, centers and again, when we call the box at some point, when we, the city folders, will be transferred that won't be deleted on the ihf that doesn't have any overhead either. So at the moment, the cutter and, of course, have a sticker at the top. Don't call fried up there, but if he froze properly up there, then that would n't be a job at all.

A

That's one great thing, because you can somehow abstract without having any upper hand. Yes, that.

B

A

A great thing, and that plus, if you know that the liquid can get an idea of how this box could be implemented, it's not necessarily implemented like that So. First of all, we have our box, and that is about going for a tea today, where we will later be able to show the blocking in our new method. First of all, we need a thick unsafe blog.

A

The predecessor fits and, first of all, we don't go there. Either. currently call some method from the city, library or something else that does that now gives us a rob further back. That should be so much further written down on the pippa. You still have a few things on the then we say behind the further hand, writes there, and then we go back home box. We not so very exciting, but good, so concept next to it, which of course,.

B

Is now fourth, what exactly is exactly that now.

A

Also not so exciting because it shows sure my write to the center, then we say.

B

We believe that an.

A

In place place does it for all factions who says so openly job.

B

A

Value the set against it and then let's say whether your this value, we would, of course, also like that this reacted. Save too times is blocked.

C

A

If we are in a box on the vector are right, of course, also that the rector also his saliva, quick again, it would be nice that would not have- and here again the note that is all probably at best. This is now just there and somehow to illustrate if you will implement it that way good, but we want to understand you a little bit next to the next type of friend smart. Next, when I reach the graphics card, I will know the last type will.

A

Write the rest of the way, the slides. It's called that care, pda and differentiated, and this goal can now have several folders or what the pointer points to can have several without imagine, you want to share something with several people here, but not who of you gives first and gives it back last period. Your last of the scope goes the should effort. He should release it that 's, somehow. What is definitely desirable that you would be without a hat and a last one clears up as soon as it.

C

A

As I said, the guaranteed by this, when the stop of the last month is over, we'll see how that goes, can look like we're watching a stream is showing, and if there is n't enough sit down here, tell me then right away and clown. It's important that plans now next spring string could be forever long. It won't be born, there's always only one string instance in memory. What 's being done is that she will be contacted the index in vienna.

A

Everything is fine and you point a and b to the same thing in the neighborhood out to the same string that bzb outputs like this, also give a chance to drink behind the now delete drink, not there. Yet it is yes. Mobile from the scopas comma is still there.

A

There is still a folder today and we can spend and only end here at some point if the score goes out, then here actually the drinking lets read this goal in lille also resorted to what we will also see later, how we can circumnavigate that, but that's the main of center there's another brother, broad, tony carey reference card. That means it says reference sound will be accordingly, that always counts up dieter zimmer atomic counts.

A

That means several threads can access it at the same time, if we so normal days and several threads at the same time could increase the race condition for and strange things here. We just make sure that it goes from several threads. That's why you can also distribute this park over the network. We see that we are slowly approaching multi threading like this, and also here song again to everyone who can implement this.

A

If everyone pays reference counted, he also says somehow what you have somehow has to have that now again has some friend on the shared hardest, so close that contains a rebound and the data we want to talk to. We want a new one us here. We present our new shirt object pack, that on the neighborhood and set the reference course to 1. Basically what we just did today box, but that we are fat on our ribs now, after almost something more two things don't implement, which at all things you have to implant in trades,.

B

A

Chunk exactly because that's not quite clear yet this reference comes. It should count how many are alive right now and so still have to be. Eight a new folder is created and with the squad leader. Without that's why we need to dress and applied clown to what have to do at the.

A

End in london or just count mainzer stage and then give back a new one, then from aasee, which objectively points to the same thing. If you just import two units pointing to the same object the job, because.

A

We count by 10 and then, of course you only have it tested is the ref is now zero. If so, then, right away, I.

A

Think that makes it less so we see that somehow it works gutmann from currently still this account with cells, nor that neither is not the right presentation, but so to illustrate again in memory at when we have our husbands. That is also becker.

A

We have a fix, so it happened the very first time we have this object, sabine, often yields, and that consists of a friday, as we just saw these counter points on the blow that is always with his level, wants to solve the cloud that an second and that our object cares. That is a right. Then, this data day always the same. That does n't change anymore, about rap, except for 1, so after usf1, then we'll just do it one coop on and put us on peter announced and clown what happens later again.

A

The stack is also due to a friend of the point s pointing to the same thing and the refco either fix does not change so discount. The fto 2 next step is to close this scope again, peter cutlery taken that means no longer shows it and computer reset to 1.

A

Yes- and that was too fast, but here the last one is over sabine wirth from the strong boss, cordes to.

B

A

There is a problem with this condition that I have already spoken to. You can yes now somehow losing his cycle in bavaria, rcs that point to themselves, and then they will never be jogged everyone. He still has an old man in the other nazi who references others again and so on. That means it will never be a small problem, because the referee on the tarmac to make sure you can sometimes use the smart truck way. That's like percy's sister. That does that that 's exactly the same thing. It was then increased quite a bit.

A

So if a quieter one exists, then you get that you're legal, that's also with pc, and that can still ask if the original access object still exists. That can also grab the original object. Who does that with downgrade and bring back the original object with upgrades an example if this afrika 27 is in it, and now we can a reporter create rhetoric, point downgrade that can be done with this judgment, not particularly for the only thing we can really do with, it is to say upgrade and upgrade now.

A

Look at the runtime is because that has already been deleted or not yet. So there is a headstand back anyway metern that 1, because the original from she is still alive now, but we can do things like that. We give the reporter back to skanska and expand.

A

That means the last one, without also on the 27, goes out of scope and deleted 27. If he now calls for an upgrade at the rental price once back, that means the way further. There can not be sure that the other also keeps alive, but we can take a look, and so we can also break up cycles. A good example is my tree: if you somehow build under villas and start up again and barbs, somehow you don't want that in both directions. She's already perfect circle, two get up there.

A

You usually want the father to always own the children, so a nazi downstairs has somehow upstairs is always just further. That means the children can go up to grab their drivers, but we don't know that's why it wo n't automatically point to that. We need you can.

B

A

It differently in that the father simply owns the children directly with a box. The children only have one reference. The father now has references.

B

A

That decency again a bit more complicated, but you could definitely do it that way. I think you can stop here next time. We will all look at this in scary term. It ensures that we can change things within an 18. There are still questions so far. Okay, then see you on wednesday.