Tag：member
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Time：2021-6-22
1、 Possible problems caused by the change of cluster members Cluster member change is a common operation, mainly to add and delete nodes. The main scenarios include upgrade, server aging, etc. of course, if we don’t have much requirement for SLA of service, it’s the easiest way to shut down the cluster directly. But if […]
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Time：2021-6-14
Various errors in configuring nginx in Ubuntu 18.04 lackPCRE Library Compiling nginx An error occurred Error installing PCRE Library Manual compilation and installation of PCRE Library (1) Download and unzip the PCRE library wget https://ftp.pcre.org/pub/pcre/pcre-8.43.tar.gz tar -xvf pcre-8.43.tar.gz (2) Compile and install PCRE Library cd pcre-8.43 sudo ./configure sudo make sudo make install Recompile nginx […]
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Time：2021-6-11
◇ vptr&vtbl Object has a virtual function pointer in memory, which generally exists before the data member. The virtual function pointer points to the virtual function table, in which the address of the virtual function is stored in the order of function declaration. We can use (* (P – > VPTR) [n]) (P); Or (* P […]
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Time：2021-6-8
Today’s sharing begins, please give us more advice~ This article gives you a brief introduction to the loading of the next class, as well as the specific implementation. You can operate it yourself! Class loading After the program runs, the first time a class is used, the bytecode file of the class will be read […]
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Time：2021-6-6
v1.2.8（2021-03-08） Update content Database migration script collation Data table soft delete field collation WeChat official account routing Refund increase handling charge logic Course addition does not support refund logic Member price and term can be configured through the background Fix problems caused by field renaming in IM notification Fix the problem that the purchase member‘s […]
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Time：2021-6-3
Technical editor: Ming FeiHave you reported the official account number: SegmentFault?Liu Tiandong, co-founder and director of Kaiyuan society, ASF member, also contributed to this article At the just concluded ASF annual meeting, new ASF members and board members were born in 2021. Apache Software Foundation announced the election results of the new director through the […]
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Time：2021-6-1
What is bit segment The structure of the declaration of paragraph is similar, with two differences 1. The member of bit segment must be int, unsigned int or signed int, as long as it is plastic 2. There is a colon and a number after the member name of bit segment for example struct S […]
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Time：2021-5-31
Object oriented programming has four main characteristics: abstraction, encapsulation, inheritance and polymorphism. This chapter mainly introduces the knowledge about inheritance, and polymorphism will be explained in the following chapters. Inheritance is the most important feature of object-oriented programming. It can be said that if we do not grasp the inheritance, we do not grasp the […]
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Time：2021-5-11
Hello, everyone. In recent days, I have rearranged and classified some of the contents of the written interview summarized in last autumn’s recruitment. It’s divided into three partsResume writing, interview skills, face to face summary, written interview eight part essay summaryAnd so on four parts. Among them, the eight part essay is divided into three […]
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Time：2021-5-9
In the actual project development, we often encounter the situation that we need lightweight queue, such as SMS, email, etc. these tasks are not enough to use Kafka, rabbitmq and other heavyweight message queue, but they do need asynchronous, Retry, concurrency control and other functions. Generally speaking, we often use redis, beanstalk and Amazon SQS […]
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Time：2021-5-6
1 Introduction to redis Redis (promote dictionary server) is an open source, network-based, memory based, persistent key value pair storage system written in ANSI C. At present, the most popular key value pair storage system. It is often used as database, cache and message queue. Advantages of redis： The efficiency of memory based database is […]
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Time：2021-5-6
1. Pointer to the data member of the class: The format of the statement is as follows: < type specifier > < class name >: * < pointer variable name >; For example: class A { private: int a; public: int c; public: A(int i) { a = i; }; int Fun(int b) { return […]
