how to understand this line of code? static void * a = &a; I saw it on the source code of AFN. static void *AFHTTPRequestSerializerObserverContext = &AFHTTPRequestSerializerObserverContext; The AFURLRequestSerialization.h file is used wh...
is a parser, implementation of a MIDI file. A class, can read the midi and then manipulate the notes or tracks (adjust the length of the force or delete insert the pregnant woman), and then export the midi. No suitable one has been found at present. T...
A simple interface program that accepts username and password, slot function is temporarily empty, compilation can pass, runtime error. passwddialog.h -sharpifndef PASSWDDIALOG_H -sharpdefine PASSWDDIALOG_H -sharpinclude <QDialog> class QLabe...
the original rule is as follows [1-9] {1} [0-9] {3} now I want to rule out the result of 2035. How do I write it? because I m in a hurry, I can t think for myself. Regularity is my weakness. Thank you! ...
when I read a book, I write the following code and type . -sharpinclude<stdio.h> -sharpinclude<stdlib.h> *acb* void butler(void); int main() { printf("a"); a butler(); void butler printf("b"); b return 0; ...
I was bored on the subway. I wanted to write code. I wanted to find a code editor like webstorm. then I searched for a long time, but I couldn t find a suitable one. I just found a codeanywhere, because I haven t experienced it yet, but I still want ...
1. As shown in the figure, class b inherits class a, and the constructor of class b calls the constructor of a. The error of redefinition of formal parameter I appears where the arrow is hit 2.a(i)b ...
when I see the conditional variables section of CPP11, I find that all conditional variables are used in conjunction with locks, but at this time they all use unique_lock instead of lock_guard,. Can you explain that? ...
for example, if there is a set of numbers such as 1, 2, 5, 7, 11, 14, how can Filter come up with two sets of numbers: [1, 2] and [5, 6, 7, 7]? ask for advice ...
in MFC development, how to switch tabControl pages with a button? for example, in C-sharp, you can click the button to switch pages by adding the following statement to the button: this.tabControl1.SelectedIndex = 2; but only these two attributes ...
in MFC development, how to change the picture content of pictureBox by clicking a button? this property in pictureBOX: how to add code to the button to make pictureBOX load another picture when you click the button, thank you! ...
< H1 > include < iostream > < H1 > < H1 > include < time.h > < H1 > < H1 > include < stdlib.h > < H1 > < H1 > include < math.h > < H1 > using namespace std; problem: partition function does not work effectively; typedef double Type; typed...
QDateTime valid = QDateTime::fromString("2018-Apr-5", "yyyy-MMM-d"); use qDebug () output valid to directly say that it is invalid, what is this all about? It is not valid to use an example in the official document: QString s...
CPP11 allows list initialization for all objects, and because the constructor body is assigned, references and const variables must be initialized first, so you must use list initialization, so how is it initialized before CPP11? ...
cut the rope, cut the rope of length n into m segments, and find the maximum value of the length product of each segment I would like to ask myself what is the idea of typing n and m ....
platform: windows10 after I use the start function of QProcess to execute the local (current directory) python file, I can t get standard output from readAllStandardOutput. Code of python file: print "hello,world " Qt Code: -sharpinclude <QP...
this is an algorithm for calculating palindromes less than 100,000 primes written with CPP . -sharpinclude <iostream> using namespace std; int main() { int input_num=100000; int pp_count=0; for(int each=2; each<=input_num; eachPP)...
whether the data transmitted by socket needs to be encrypted ...
I did a question on leetcode, but for the string type, the push_back concatenation character failed the test, but changed to the plus sign to concatenate the character and passed it. topic link my two codes: class Solution { public: vector<...
here is the log at startup 2018-04-17 06:13:59 InitParameterInteraction: parameter interaction: -connect set -> setting -dnsseed=0 2018-04-17 06:13:59 InitParameterInteraction: parameter interaction: -whitelistforcerelay=1 -> setting -whitelistre...
BFC has a feature: child elements in the BFC container do not affect the outer elements, and vice versa; however, as shown in the following picture, the blue box floats to the left and the orange box does not float. The blue box affects the orange box...
how long is the cache time of Mini Program setStorage ...
vue ssr rendering, using element-ui as the ui library. For a page that uses the el-select component library, there is no problem with entering it for the first time, but when it is refreshed, there will be a call stack overflow: Vue: there is no sp...
The code is as follows app.get ( getToal ,function (req,res) {) db.query( select count(*) as totalNum from t_package ,[],function(result,fields){ res.send({code: 200, message: "",data:result}); }) }); the local service written in n...
I have a requirement: in my php web project, I think there is a write variable that can be accessed in all php files. For example: hold the variable of token. I define it in a tokens.php, but I don t want to require the tokens.php file anywhere els...