Directory 1. Introduction to iterators 2. Applicable scenarios 3. Advantages and Disadvantages 4. Use cases 5. Case (python implementation) 1. Introduction to iterators There are many different types of iterators in Python that are used in different ways of traversing and accessing collections of data. Here are some common Python iterators: List Iterators: Use a […]
Tag: iterator
ES6 Iterator and for…of loops
1.iterator concept ES6 added Map and Set. So there are four data collections, and a unified interface mechanism is needed to handle all different data structures. Iterator is such a mechanism. It is an interface that provides a unified access mechanism for various different data structures. As long as any data structure deploys the Iterator […]
[Python 4] List and tuple slice slice iteration list generation generator generator iterator iterator object
L = [] n=1 while n < 100: L.append(n) n = n + 2 In Python, more code is not better, but less is better Taking some elements of a list or tuple is a very common operation. L = [‘Michael’, ‘Sarah’, ‘Tracy’, ‘Bob’, ‘Jack’] r = [] n=3 for i in range(n): r.append(L[i]) r […]
C++ Supplement Implementation of reverse iterator
Prerequisites for reading: This article is mainly a supplement to the implementation of list and vector. It focuses on code implementation and is supplemented by comments. If you are interested in the underlying implementation of vector and list, you can read it by yourself. The amount of code is a bit large. Please read it […]
C++: Understanding of simulation and implementation of iterator modules in vector and list
Article directory Comparison of iterators between list and vector The implementation process of list Complete code This article is about the simulation implementation of vector and list, a further understanding of the iterator module, and the addition of the implementation and implementation of reverse iterator based on the previous article. Comparison of library functions, etc. […]
07 | Iterators and the handy new for loop
We’ve already talked about containers. In the process of using containers, you should also have more or less understanding of iterators. Today, let’s talk about iterators in a systematic way. What is an iterator? Iterator is a very general concept and not a specific type. It’s actually a set of requirements for types. Its most […]
Implement reverse iterator by reusing list and vector forward iterators
First of all, when we first started learning stl, we knew that stl contains six major components, among which containers, iterators and algorithms are one of the six major components of stl. So here we think about a question: What is the meaning of iterator? We know that containers are meant to store data, and […]
[Relearning Python]: Python extended iterator
Write before Iterator First, let’s look at a way to check whether it is iterable: >>> hasattr(list,’__iter__’) True You can use the above method to check whether other default types of objects that have been learned, such as strings, lists, dictionaries, etc., are iterable. iter() is a special method that is the basis of iteration […]
Use three methods to access images, pointers, iterators, and dynamic address calculations
Use three methods to access images, pointers, iterators, and dynamic address calculation Pointer access Method 1 #include <opencv2/opencv.hpp> #include <iostream> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> using namespace std; using namespace cv; #include <iostream> #include <fstream> using namespace cv; //Contains the cv namespace #include <opencv2/core/core.hpp> #include <opencv2/opencv.hpp> //———————[Global function declaration part]—————– ——- // Description: Global function declaration […]
[C++] Vector simulation implementation | Problems when using memcpy copy | Implementing deep copy | Iterator failure problem
Table of Contents Basic framework and interface Constructor No-argument construction Iterator range construction Initialization construction destructor size() | capacity() Expanded reserve() Problems using memcpy copy resize() to change size operator[] Iterator implementation Addition and deletion of vector End insertion push_back() Tail deletion pop_back() Use insert and erase to discuss the issue of iterator failure insert() […]