Oh, also interesting
by the way, should it be std::move(*this) in the first variant?
i couldn't find a source so i started testing. you were right, return *this causes a copy. but return std::move(*this); calls the move constructor. it seems there is no way to completely avoid a function call.
https://godbolt.org/z/fs53Whvz5
Anonymous
Pavel
i couldn't find a source so i started testing. you were right, return *this causes a copy. but return std::move(*this); calls the move constructor. it seems there is no way to completely avoid a function call.
https://godbolt.org/z/fs53Whvz5
not sure what you mean by avoiding function call, but I think it may have been pretty unsafe if *this could be moved away like this on any function call on rvalue ref object :)
Pavel
Well, after some thinking, maybe it wouldn't be unsafe
If it's temporary, it doesn't matter
If we do std::move, then we should be ready to that
Massi
can someone give me some c programmes to read
Vlad
Choose the C language and off you go
Anonymous
not sure what you mean by avoiding function call, but I think it may have been pretty unsafe if *this could be moved away like this on any function call on rvalue ref object :)
> not sure what you mean by avoiding function call
https://en.cppreference.com/w/cpp/language/copy_elision
(the situations mentioned here are language guarantees, not compiler optimisations)
Diego
struct A {
int i;
int j;
A() : j(0), i(j) { }
};
Could someone explain why this produces UB?
Niharika
👍
Massi
How to write a programme which inverses the numbers like 1234 inverse it to 4321
JR
How to write a programme which inverses the numbers like 1234 inverse it to 4321
Use modulo and division.
Massi
Division and modulo using the number 10?
JR
Yes
Massi
Okay thanks
JR
I'm glad to help.
Swostik
How to fix linker error in vs code 2020?
Damo
Can anyone help me to create bin and image file in petalinux compiler
Igor🇺🇦
Plzz do explain.
What's there to explain? You have linker error, it's given by compiler and not related to IDE you're using.
No one knows what exact error you have.
Swostik
OK.... I will look into it
Sandro
How to write a programme which inverses the numbers like 1234 inverse it to 4321
int revnum(int num) {
int rev = 0;
while (num) {
rev = rev * 10;
rev = rev + num % 10;
num = num / 10;
}
return rev;
}
H
struct A {
int i;
int j;
A() : j(0), i(j) { }
};
Could someone explain why this produces UB?
in class and struct , member variables allocate from top to bottom.
H
first i, then j
but you try to do unlike that.
Anonymous
/get cpp textbook
Meftahi
/get
.
When I install vs code I get error saying: "An error occurred while trying to rename a file in the destination directory: MoveFilefailed; code 2. The system cannot find the file specified." It is giving me option to skip and if I skip then while writting the code there are something that are not being done like while writing HTML code if I put "! " I not getting the boiler plate and some other issues are also there pls help. I have tried both 32 and 64 bit having same problem in both
Please help
EG
Have you tried installing with elevated privileges? As admin?
.
No
.
When I install vs code I get error saying: "An error occurred while trying to rename a file in the destination directory: MoveFilefailed; code 2. The system cannot find the file specified." It is giving me option to skip and if I skip then while writting the code there are something that are not being done like while writing HTML code if I put "! " I not getting the boiler plate and some other issues are also there pls help. I have tried both 32 and 64 bit having same problem in both
Please help
I had installed before and simply uninstall after few month when I tried to install it give these msg
EG
I had installed before and simply uninstall after few month when I tried to install it give these msg
Try with elevated privileges
.
Okay sir thanks
MRT
hey
how i can fix socket buffer size ?
if client send big data to server , the server does not receive it and
another data must be sent to the server so that I can get the previous data , I marked the data, and it's interesting to me that other small data that is sent after the big data is sent to the server sooner.
Ammar
hey
how i can fix socket buffer size ?
if client send big data to server , the server does not receive it and
another data must be sent to the server so that I can get the previous data , I marked the data, and it's interesting to me that other small data that is sent after the big data is sent to the server sooner.
When a client send large data to server, the server may receive partial bytes of it, in this case, the server must call recv() again until the data is fully received.
How does server know that the data is fully received?
This is how it works...
You have to add length identifier at the beginning of your packet, and always save the return value of recv(), the return value indicates how many bytes is read from the file descriptor, and then compare the value with the expected length. If it's below the expectation length, you have to call recv() again and accumulate the return value until everything is fulfilled.
Ammar
See my work for example:
https://github.com/TeaInside/teavpn2/blob/d1a999952ca44210a904d4061529615334a3b032/src/teavpn2/server/linux/tcp.c#L1166-L1306
MRT
When a client send large data to server, the server may receive partial bytes of it, in this case, the server must call recv() again until the data is fully received.
How does server know that the data is fully received?
This is how it works...
You have to add length identifier at the beginning of your packet, and always save the return value of recv(), the return value indicates how many bytes is read from the file descriptor, and then compare the value with the expected length. If it's below the expectation length, you have to call recv() again and accumulate the return value until everything is fulfilled.
i marked data with special character and length, i can get length before data sended
MRT
i marked data with special character and length, i can get length before data sended
in qt we dont have recv ! if data is not complate socket->readall() most be call again ?
Ammar
i marked data with special character and length, i can get length before data sended
You better of specify how many bytes your length identifier.
See:
https://github.com/TeaInside/teavpn2/blob/d1a999952ca44210a904d4061529615334a3b032/src/teavpn2/include/teavpn2/net/tcp_pkt_client.h#L39-L53
In the above case, I have to receive sizeof(tcli_pkt_type_t) + sizeof(uint8_t) + sizeof(uint16_t) as initial minimal packet length. After I received them, I can then decide whether the data is completely received or not based on that minimal packet length. Because minimal packet length contains how many bytes to be received.
Ammar
/report
Ammar
in qt we dont have recv ! if data is not complate socket->readall() most be call again ?
I don't use QT, so IDK about readall().
.
What should I do please help
.
I use insiders version also but it is not solving
.
Please help🥺🥺
.
Please anyone about it
Ryno
I am a newbie/beginnee
Anonymous
Can you please help me
MRT
for simple chat server, how many connection needed ?
EG
hey
how i can fix socket buffer size ?
if client send big data to server , the server does not receive it and
another data must be sent to the server so that I can get the previous data , I marked the data, and it's interesting to me that other small data that is sent after the big data is sent to the server sooner.
Have you tried using grpc? Looks like reinventing the wheel
EG
Please don't ignore help me
Remove completely the folder where the vs code was installed and try again the release version
klimi
.
HaiNahi
Contribute to this project
HaiNahi
https://github.com/SwastikMajumder/cpurenderer
HaiNahi
https://youtu.be/-gmR-pKFskE a output example
Mr.
Hi
Mr.
Anyone know c#
Mr.
Ok
Gulshan
https://del.dog/nopollyreb.txt
Gulshan
What should be done here ?....
Ludovic 'Archivist'
https://del.dog/nopollyreb.txt
you don't want vector<int> array(n); but
vector<int> array;
array.reserve(n);
Ludovic 'Archivist'
https://del.dog/nopollyreb.txt
https://en.cppreference.com/w/cpp/container/vector/vector
Look at the overload (4) that you were using
Look here for reserve: https://en.cppreference.com/w/cpp/container/vector/reserve
Gulshan
Thanks buddy 😊
كتابة بحوث 💻
Write a C ++ program that adds three double numbers into a subfunction that receives pointers?
Please Help 🥲
Ammar
Write a C ++ program that adds three double numbers into a subfunction that receives pointers?
Please Help 🥲
It's not code-writing service group. You can't ask this in this group.
Pavel
struct A {
int i;
int j;
A() : j(0), i(j) { }
};
Could someone explain why this produces UB?
Order of initialization of class members is the order in which member appear in the class declaration.
In your case i is being initialized first and is being initialized with value of j which isn't initialized yet.
I'm not sure if it's UB, but it definitely is not correct code.
Diego
Thanks