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Basic knowledge of C + + (I) 1. Foreword 👉👉 In 1979, C + + was born and sprouted. In 1983, it was officially renamed C + +, Benjani Strauss LUP (Bjarne Stroustrup). C + + can carry out both process oriented programming in C language and object-oriented programming (encapsulation, inheritance and polymorphism) in Java language. It ...

This paper will realize the simultaneous coding and multiplexing of the collected preview frame (add filter) and PCM audio to generate an mp4 file, that is, to realize a small video recording function imitating wechat. Audio and video recording and coding process This paper adopts software coding (CPU) implementation, so when aiming at high- ...

Several installation methods of Qt under ubuntu This article introduces a variety of installation methods, including apt package management system, binary package, source code, and online installation of Qt SDK and Qt Creator. apt Execute the following commands in sequence # Open the terminal, right click on the desktop - > open term ...

Zero. Preface C + + has five characteristics: object, encapsulation, inheritance, abstraction and polymorphism. The chapter will explain polymorphism in C + + 1, Concept and definition of polymorphism Concept: Generally speaking, it is a variety of forms. Specifically, it is to complete a certain behavior. When different objects ...

I feel like I'm redeeming the sin of not practicing the algorithm well in College for three years 😓 1. Summary of knowledge points The knowledge points involved in this operation include: string manipulationSTL + sortgraph theoryBST tree (time complexity) Title numberdifficultyKnowledge points1140🐸String and number conversion + English Re ...

Designing a class can only create objects on the heap The desired effect is that you can't create objects directly on the stack. First of all, cpp needs to call the constructor as long as it creates an object, so first ban the constructor and design the constructor as private. But you can't create it yourself. Therefore, a created interf ...

Vector is like the Swiss Army knife of C++ STL container. Bjarne Stoutsoup has a saying – "generally, if you need a container, use vector". Ordinary people like us regard this sentence as truth and just need to do the same. However, like other tools, vector is just a tool. It can improve efficiency and reduce efficiency. In thi ...

1. Create a thread Creating a thread is relatively simple. Instantiating a thread object with std thread completes the creation. Example: 1 #include <iostream> 2 #include <thread> 3 using namespace std; 4 5 void t1() //Ordinary functions used to execute threads 6 { 7 for (int i = 0; i < 20; ++i) 8 { 9 ...

brief introduction SwitchButton is a very common and practical button. I was surprised that there was no Switch in Qt, so I had to implement it myself. effect The renderings are shown below Control split 1, The control is generally composed of two parts, one is the background and the other is the white slider. The original background was ...

1. Situation and intention   we store a lot of food in the freezer. For mothers, opening the freezer is mainly to cook with vegetables and meat, and for children, it is mainly to take ice cream and drinks.   in daily development, there must be some classes related to data structures, such as the model for designing data stora ...