Scientific counting is a convenient method used by scientists to represent very large or small numbers. It satisfies the regular expression +- ". " [0-9] + estrangement, that is, the integer part of a number has only one digit, and the decimal part has ...
I have an one-dimensional array, which contains the letter Amurz. If you want to find out all the unique combinations, the combination type is 1-to-many, for example: the letter A can be combined with any other one or more letters, please give a Demo or...
as a pc client, the QT5, client comes with a web browser and asks them that it comes with QT, but when I do front-end development on this browser, some of the CSS attributes are incompatible, such as this: cursor: pointer;, it seems to be unknown, and ho...
whether to write code is whether the more intermediate variables are written, the better such as a point: public class Point{ int x; x int y; y int isExist; x,y int quadrant; x,y } is it necessary to crea...
int flag = 1; setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&flag, sizeof(flag)); servertcptime_wait server2server socket reuseAddress, ...
I know that just because the socket send function returns successfully does not mean that the other party will receive it successfully. In general, we have to ask the other party to answer "copy " or not? Especially on the mobile end, the traffic on the...
write a function that divides words based on characters, and the above problem occurs when called. -sharpinclude<iostream> -sharpinclude<vector> -sharpinclude<string> using namespace std; vector<string> split(const string&...
when learning the reactor model today, I referred to the code written by others. reference blog address: https: blog.csdn.net u011693. the following are the questions to be asked: 1.reactorreactor_impl 2.reactor CPP rookie, also hope to be able t...
suppose that ABCD class, BC virtual inheritance from AMagle D inherited from BC,A class virtual function (not overridden at the same time in BC) and member variables belong to the internal of the class, if both of them solve the ambiguity, it can be solv...
ref: StackOverflow s question address The answer explained that weak reference counters have an impact on the life cycle of control block. I understand that new is different from make_shared, but I don t understand why control block needs to maint...
Update gcc, with brew under < H2 > mac there are a lot of header files that can t be used! < H2 > as the title for example, write a helloworld 1 -sharpinclude <stdio.h> 2 -sharpinclude <stdlib.h> 3 int main(){ 4 printf(&quo...
struct stc { int arr[1]; flexible array member is not supported in CPP }; void test(std::initializer_list<int> lst) { for (auto l : lst) std::cout << l << std::endl; } int main() { stc s; for (int i = 0; i &l...
the YUV420 data is obtained by pulling the data. How to transfer the CMSampleBuffer, that needs to be converted to kCVPixelFormatType_32BGRA? ...
test.cpp int main(){ return 0; } suppose a simple .cpp file is compiled into executable test, via gPP test.cpp-o test if other extraneous .cpp or library files are linked at compile time, such as gPP test.cpp-lpthread-o test , gPP test.cpp b...
I ve tried ver. 1.64.0. Cross-compilation for aarch64 boost uses version 1.64.0; cross-compilation uses platform centos 7, and the target platform is aarch64; cross-compilation tool . first step: . bootstrap.sh step 2: modify the project-config...
how does asp.net call internally? is this a static calling method? ask for similar code . public static string Getdata(string sql) { string connString = ConfigurationManager.ConnectionStrings["QHSE_ANConnectionString"].ToString...
background: the SDK of the hardware can obtain the time stamp and identification of the vehicle passing through a specific location. current practice: SDK stores the data in mysql, and web queries all the scores of all vehicles through polling, and the...
The function of placement new is to perform the construction of objects on the memory allocated by operator new, so did new operator use placement new after using operator new to request memory? If not, how is it constructed? Does it have anything to do ...
I am learning linked lists now. The linked list that the teacher taught us is different from the way it is realized on the Internet. So I want to know what are the advantages and disadvantages of these two implementations, and why the vast majority of p...
this is the insert function of the array linear table written in CPP. In the second if condition, there is no problem if you use listSize+1, but there is an error (non-compilation error) if you execute the listSizePP program . void insert(int location, ...
`i` function makeCounter() { `i` `makeCounter`. var i = 0; return function() { console.log( PPi ); }; } `counter` `counter2` `i`. var counter = makeCounter(); counter(); logs: 1 counter(); logs: 2 ...
preliminary learning Node, keeps reporting Cannot read property isDirectory of undefined, when doing a read about files, judging whether the type of each file is a file directory, and then I try to use isFile, to also report undefined related code...
What s the use of ? ...
after the component introduces iview s Select drop-down list. After registration as a local component, no matching data is displayed. < div class= "select-plate " > <span>:< span> <Select v-model="model1" style="width:...
as the title < H2 > the interface code is as follows < H2 > get avatar file_id router.get( avatar , async (req, res, next) => { const id = req.query.file_id const url = await FileModel.getFilePath(id) res.set( content-type , ...