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Виртуальное наследование c++. Ромбовидное наследование c++. Изучение С++ для начинающих. Урок #114

Виртуальное наследование c++. Ромбовидное наследование c++. Изучение С++ для начинающих. Урок #114

Channel: #SimpleCode

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continue to study programming

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using the example of the C plus plus language in one of the

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previous lessons we looked at

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what happens during the destruction of a

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class object, namely at the moment

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when the class object goes out of

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scope or for some reason a method or

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a function, or the same

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main function, and you and I know that at this moment

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the destructor is called,

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which is cool, but what will happen

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if we have such a class inherited from

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other classes, and such a chain of

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inheritance can have a rather

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long form, for example with ours

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class c from the last lesson which she on

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the left is inherited from geoby

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hotel we will look at the answer to this question today

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in this video and before we

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start I want to remind you that next to the

00:00:52

button to subscribe to the channel there is a

00:00:54

special bell by clicking on which

00:00:56

you will not miss any new video

00:00:58

that comes out on the channel because you

00:01:00

will receive a notification about this that I

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recommend that you click this bell

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Well, we will continue and actually

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our task for today is to determine

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how destructors are called when

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destroying class objects. In

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fact, while we have the simplest

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primitive classes in principle then we don’t

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care in what order they are called,

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but if you and I have a complex

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class structure and, for example,

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memory is dynamically allocated in these classes or

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some resources are requested that

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need to be freed, then this moment

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will become critically important for us, but more on that in

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future lessons today we are talking specifically

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about the order of calls to the destructor in

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order to find out how

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the destructor is called, it is

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enough to implement such a destructor in

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this way

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and at the destructors moment of its highest we

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will output to the console a record that

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such a destructor was called,

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let's implement these destructors for

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all classes

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actually Now we can carry out our

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experiment, as I already said,

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the destructor is called when a

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class object goes out of visibility or

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some function or method but or the

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main function, for example, and in this case,

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the destructor for any object of our

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class will be called

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here at the moment completion of our

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program, more precisely, even here at the moment of

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calling the keyword are torn

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because at this moment we will exit the

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my functions, let’s first create a

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class object and to check that in

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general everything works correctly for us, this is

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our simplest class and

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when we create

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the constructor is called when it leaves the scope of the

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may on the destructor is called

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let's now change our class pain

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a-class b-class by we have inherited from

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and and as you remember, in general, when

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inheriting we have this

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picture glosbe includes and classic

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c we won’t talk about it yet so

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when we create an object of class b at

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the moment of calling the constructor of class b

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class b calls the class constructor this is

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material from the last lesson

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in fact in our class b there will

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be a class so that kvass can

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interact with it use its

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function Well, let’s add here another

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seal like this

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with two double ones so that we can

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see it better and run our program.

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Look at the moment of creating our class

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b, the constructor of the class is called, then the

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constructor of class b is called

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because we have copies of the atlas at the

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moment when our the object

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in this case is in or out of the

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scope of the main function,

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the destructor is called for it

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and then the destructor of the class is called,

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hey,

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the destructor is always called in the

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reverse order by the constructor, that is,

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in fact, we parse the class in reverse

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order, it’s like a nesting doll, that is, so that in

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this case, so that parse the class hey,

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which for us is actually

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a component of class b, we need to first

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parse glosbe,

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so we parse glosbe, then

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parse the class kai in the reverse order,

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if we, for example, create an object of the

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class goal, then everything will be

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virtually identical in the same form

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only in longer options

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because our inheritance chain is longer than us

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class c inherits from class b b

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inherits from class a therefore

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the constructor is called first and although we create an

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object of class c we first call

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the constructor and then b then c because

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they are all its components

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a person with the components of class c, when

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destroying an object of class c, we

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actually begin to disassemble this class c

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like a nesting doll or unwrap it

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like candy, we first kill the class

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c itself, we destroy it, that is, if we follow

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these are the pictures we take and this is what we

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remove when we take pictures in this

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shell the class c itself we still have

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class b class and in this we

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parse class b

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after we have taken it we can

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start parsing the class and in fact

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what we are doing here

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in the end we have the order of destruction of a

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class object in the reverse order its

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creation, but it’s like a pyramid, we can’t

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pull out the lowest cube from our pyramid,

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we have to do it in reverse

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order, otherwise everything will fall apart, everything

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will stop working, this is the logic

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and scheme for calling

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class destructors during

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inheritance, and that’s

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all I have for now if you liked this video

00:06:12

was useful and interesting to you, don’t

00:06:14

forget to like it and

00:06:15

share this video with your friends,

00:06:17

this will greatly help the

00:06:19

development of the channel because you just see

00:06:21

more people and of course, if you haven’t

00:06:23

subscribed to the channel yet, then subscribe for a long time

00:06:25

so that don't miss the

00:06:26

next lesson and close the bell don't

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forget to thank you all for your attention bye

Description:

Понравилось видео или оказалось полезным? Подпишись! Поддержка канала https://www.patreon.com/SimpleCode Порядок вызова деструкторов при наследовании. Деструкторы. ООП C++ Для начинающих #101 Порядок вызова конструкторов при наследовании. Как вызываются конструкторы. ООП C++ Начинающим #100 https://www.youtube.com/watch?v=sNInKQgUZMA&list=PLQOaTSbfxUtCrKs0nicOg2npJQYSPGO9r&index=118&t=17s Уроки по программированию Наша группа ВК https://vk.com/smplcode Подписывайтесь на канал https://www.youtube.com/channel/UCtLKO1Cb2GVNrbU7Fi0pM0w

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