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C++

July 6, 2018, 4:26 a.m.

factorial, lambda, C++, лямбда функция, факториал

In the previous article , we got acquainted with the structure of lambda functions, and now we'll play with lambdas, calculate the factorial, and consider how the lambda function can be applied for this.

Let's consider for the beginning the usual variant of factorial calculation, and also we will specify that such a recursive function.

Recursive function

A recursive function is that function that calls itself. This means that inside the function there is a call to itself, and infinite recursion can occur if the function code does not have the conditions for exiting recursion.

Here is an example of such an infinite recursive function, the program with which it terminates crash due to overflow of the call stack.

#include <iostream>

using namespace std;

void infiniteRecursiveFunction()
{
    cout << "Hello World!" << endl;
    infiniteRecursiveFunction();
}

int main()
{
    infiniteRecursiveFunction();
    return 0;
}

C++

Feb. 13, 2018, 6:13 p.m.

С++, лямбда функция

My favorite tool in C ++ is lambda functions, although somehow they told me that they seem scary. In fact they are lovely. They greatly simplify the writing of programs and allow you to make quite interesting decisions.

But before considering various ways of using lambda functions, I suggest to familiarize yourself with the basic syntax of lambda functions.

Possible options for the syntax of lambda functions

[ capture ] ( params ) mutable exception attribute -> ret { body }
[ capture ] ( params ) -> ret { body }
[ capture ] ( params ) { body }
[ capture ] { body }

The first option is complete, but it is not forbidden to use abbreviated variations in the recording of functions.

  • capture - list of external capture objects, they can be captured both by reference and by copying.
  • params - list of parameters passed to the lambda function, this part will be similar to writing arguments for normal functions.
  • mutable - Using mutable allows you to modify copies of objects that have been captured by copying. In the normal version, they will not be modified.
  • exception - provides an exception specification, that is, lambda functions as well as normal functions can throw exceptions.
  • attribute - provides an attribute specification, there are only two such attributes defined in the C ++ specification ([[noreturn]], [[carries_dependency]])
    • params - list of parameters passed to the lambda function
    • ret - the return value of the lambda function

Qt

Aug. 28, 2016, 11:17 a.m.

Qt, C++, lambda, QSignalMapper, лямбда функция

QSignalMapper is a wonderful class to organize the work of the signals and slots dynamically created objects. For example, the dynamically created buttons or objects in QStackedWidget. This was particularly true in older versions of the software, that is, and relied on Qt 4.8, which signals and slots system was based on the use of macros. But in the current realities of the new syntax in the indexes is much more convenient, and also supports a lambda function that can afford and does get rid of the application QSignalMapper, which will look like a monstrous throwback to new projects that use the latest version of the framework Qt and C++ language standards.

And when you consider more and congestion map() and mapped(), then it does with QSignalMapper code even more terrible, if used to connect signals and slots with the use of pointers, since it is necessary to cast the signals and slots, but more on that later.

Therefore, let us consider a small project that will be based on the example of the official documentation of Qt. Namely, an example will next. We have QLabel, QPushButton and Vertical Layout . By pressing a button in the Vertical Layout will be added to other dynamic buttons, by clicking on which QLabel will display the text from the button number in the following form: "Button 2". In the following figure shows an example of the application whose appearance will not differ, while the software implementations of the code will be a few.

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April 1, 2020, 8:03 a.m.
Dmitry Kozhinov

C++ - Test 001. The first program and data types

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C++ - Test 001. The first program and data types

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Last comments
April 3, 2020, 8:06 a.m.
Konstantin Grudnitskiy

Я надеюсь вы уже разобрались в чем дело, но если вдруг нет, то проблема состоит в том, что вы пытаетесь запустить программу из интерпретатора питона. Файл main.py это уже готова…
April 3, 2020, 6:18 a.m.
Konstantin Grudnitskiy

>>> text = 'hello world'>>> ' '.join(word for word in text.split()[:-1])'hello'>>> def remove_last_word(text):... return text and ' '.join(word for word in text.s…
March 27, 2020, 2:40 p.m.
Evgenij Legotskoj

Добрый день. В конце пятой статьи скачать можете.
March 27, 2020, 2:28 p.m.
mkdir _

Здравствуйте, а можно, пожалуйста, ссылку на целые исходники, если есть?
March 27, 2020, 4:36 a.m.
Evgenij Legotskoj

Скорее всего также, как и для установки всех остальных переменых в CMake, через использование set
Now discuss on the forum
April 3, 2020, 12:53 p.m.
BlinCT

Само собою на компе этого незаметно.
April 3, 2020, 8:48 a.m.
Intruder

Евгений, добрый день. Спасибо!
s
April 3, 2020, 7:52 a.m.
solmik

да вроде много чего установленно, если неправильный путь указать то же самое, пробовал запустить видео через плей лист (по примерам из док)и из него назад путь взять, не получилось
April 3, 2020, 5:50 a.m.
Jurij-V

Спасибо ! Поковырявшись и посмотрев интерфейс QSvgRender и т.д. понимаю что похоже нужно будет лезть в реализацию ::render(..). Кто может подсказать как и где выкачать актуальные исходники…
April 2, 2020, 2:46 a.m.
Evgenij Legotskoj

Я думаю, что это где-то описано, но в такой глубине документации и максимум в самых базовых вещах, то есть отдельно в классах этого не пишут, просто потому, что придётся писать для каждого класс…
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