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Implement singleton mode The purpose of singleton pattern is to make an object of a class the only instance in the system. The class created by the method of singleton mode has only one instance in the current process (if necessary, it may belong to singleton in a thread, for example, only the same instance is used in the thread context) ...

preface Today I reviewed the command mode, which is very interesting. Here I share it with you! 1. Command mode understanding Command mode is to separate the command issuer from the command executor so that they are not directly connected, but record these commands through a third party, and then the third party tells the command exe ...

1. Demand analysis Using C + + to realize address book management system The following functions need to be realized in the system: Add contact: add a new contact to the address book. The information includes (name, gender, age, contact number, home address, and records up to 1000 people. Show contacts: displays all contact information in t ...

LDUOJ For example, goto - > github LDUOJ Platform Developer spj development blog The spj usage rules of different platforms may be different, but there are not too many changes to be made first: Parameter correspondence args[1] corresponds to the input of data args[2] is the answer to the corresponding data, that is, an allowable cond ...

1. Title Give you an array and rotate the elements of the array K positions to the right, where k is a non-negative number. Example 1: Input: nums = [1,2,3,4,5,6,7], k = 3 Output: [5,6,7,1,2,3,4] Explanation: Rotate one step to the right: [7,1,2,3,4,5,6] Rotate 2 steps to the right: [6,7,1,2,3,4,5] Rotate 3 steps to the ri ...

Although I do not use the Qt framework, I am very interested in the signal slot mechanism. Recently, I read csdn several articles on signal slots. From my own point of view, the records are as follows: Implementation of signal slot mechanism with c + + Personal understanding of the signal slot mechanism: a signal slot is a channel that establi ...

🎈 Author: Linux ape 🎈 Introduction: CSDN blog expert 🏆， C/C + +, interview, question brushing and algorithm. Please consult me, pay attention to me and chat privately if you have any questions! 🎈 Attention column: C/C + + interview customs collection (high quality articles are constantly updated...) 🚀 catalogue 1, What is a list? ...

Entry parameter: struct vdIn * vd. 1. Turn on a usb camera if((vd->fd = OPEN_VIDEO(vd->videodevice, O_RDWR)) == -1) { perror("ERROR opening V4L interface"); DBG("errno: %d", errno); return -1; } #define OPEN_VIDEO(fd, flags) open(fd, flags) The main function is the open function, where VD - > videodevice ...

Blue Bridge Cup practice 008 Interview question 01.06 String compression String compression. Using the number of character repetitions, write a method to realize the basic string compression function. For example, the string aabcccccaaa becomes a2b1c5a3. If the "compressed" string is not shorter, the original string is returned. You ...

In some programming exercises, the string is often processed, and the string is often segmented to extract each part of the information before processing. Although C + + does not provide a direct string segmentation function such as split like python, there are some other methods to segment it. The following describes several string segmentatio ...