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preface Almost every class we write will have one or more constructors, a destructor and a copy assignment operator. It's hard to be particularly excited about these. After all, they are your basic tools for making a living, controlling basic operations, such as producing a new object and ensuring that it is initialized, getting rid of t ...

1. Data transmission design of chat room Necessary conditions: client and serverNecessary constraints: data transfer protocolPrinciple: the server listens to the message source, the client links to the server and sends a message to the server 1.1 data interaction between client and server The client sends a message to the server, and the se ...

Length of string The syntax for obtaining the length of a string is as follows. ${#varname} Here is an example. $ myPath=/home/cam/book/long.file.name $ echo ${#myPath} 29 Braces {} are required, otherwise Bash will interpret $# as the number of script parameters and variable names as text. $ echo $#myvar 0myvar In the above example, ...

preface In Python, the more code is not the better, but the less the better. The code is not as complex as possible, but as simple as possible. Based on this idea, let's introduce the very useful advanced features in Python, the functions that can be realized by one line of code, and never write five lines of code. Keep in mind that the ...

prefaceSpring, just as its name, brings spring to developers. Spring is a framework designed to solve the complexity of enterprise application development. Its design concept is to simplify development.The core idea of Spring framework is:IOC (inversion of control): that is, transfer the control of creating objects, and transfer the control of ...

1. printf segment error (core dump): a problem caused by formatted outputPost a simple example:#include <stdio.h> int main(){ int len = sizeof(int); printf("%s\n",len); return 0; } `root@ubuntu:test#gcc test.c test.c: In function 'main':test.c:5:2: warning: format '%s' expects argument of type 'char *', but argument 2 has typ ...

Write in frontIn the increasingly complex front-end engineering, the front-end engineering around webpack is particularly important in the front-end project. When it comes to webpack, the Loader mechanism will be mentioned.Here we will uncover the face of loader layer by layer from application principle implementation. No more nonsense, let's s ...

Catalogue of series articles 1. Implement crawler with C + +! preface If you are a C/C + + programmer, you should be no stranger to VS. it can be said to be a sharp weapon in the hands of C/C + + programs However, if you study deeply, you will find that most windows API s are divided into wide bytes and narrow bytes, such as the commo ...

gRPC introduction and installation 1, What is gRPC gRPC introduction gRPC is a high-performance remote procedure call (RPC) framework open source by Google, which can run in any environment. The framework provides load balancing, tracking, intelligent monitoring, authentication and other functions, which can realize the efficient con ...