no member named 'cout' in namespace 'std'

[Thomas9258]

ive made a simple hello world script:

#include <QCoreApplication>
#include <iostream>

int main()
{   
    std::cout << "hello world" <<std::endl;
    return 0;
}

I get an error in the editor, and not when running the script. the thing is, i dont get why the editor tells me something is wrong, and i dont really know how to fix it, maybe someone else have runned into the same issue?

Edit:
Thanks everyone for helping me!
mrjj's solution: Turning off "clang format" in help > About_Plugins seems to work (in hiding every clang notification thus hiding even the incorrect ones). Im fine with the solution though, they arent useful in my opinion anyway.

[mrjj]

Hi and welcome to the forums.
Its the clang code model acting up.
Not seen that for cout before !
It normally gives hints/advice about the code.

https://forum.qt.io/topic/100762/qt-creator-clang-code-model-problems-collection

Im not sure why it cant see into std.. That is new.

You can "fix" it by disabling the code model ( see link)
Or just ignore it.

[Pl45m4]

@Thomas9258

Sometimes it takes some time for it to recognize everything. Try a re-build

[sierdzio]

I've noticed this on my side, too, at least since Qt Creator 4.13 (and I think it did sporadically happen in 4.12.x, too).

I don't have a workaround. It sometimes works, sometimes it does not.

[Kopilov]

I had the same problem. This helped:
https://askubuntu.com/questions/1232969/qtcreator-not-recognizing-linked-libraries-after-upgrading-ubuntu-to-20-04
QtCreator 4.11 still relies on clang-8, but on Ubuntu 20.04 apt will install clang-10. Install clang 8

sudo apt install clang-8

[JonB]

@Kopilov
FWIW, just to confirm to any other readers that I had to do this when I moved to Ubuntu 20.04, it is indeed required.

[Skazik]

@Kopilov Thank you!! Worked for me fine