std::format errors "no matching function" and "call to consteval function"

Question

Platform: Win 10 64 bit IDE: CLION 2022.2.4 Toolchain: VS 2022 Community Toolset v17.0 (CMAKE 3.23.2) Build Tool ninja.exe C++ compiler: cl.exe

#include <iostream>
#include <string>
#include <format>
    
int main() {
    std::wstring test1 = L"Hällo, ";
    std::wstring test2;
    
    std::cout << std::format("Hello {}\n", "world!");
    std::cout << std::format("Hello {}\n", "world!");
}

Errors shown in editor:

I suspect this is a CLang error, but I'm not quite sure. I can compile the code just fine and I get an output to the console. But why do I get an error here?

I tried to find anything on Google on it, but I didn't find anything on this specific error. I know from a friend of mine that this is not an isolated issue, or at least he has the same issue.

From what I read the "consteval" was somewhat newly introduced and might still be incompletely implemented in some library functions?

when you can compile the code without error, then it is a bug / misconfiguration of the tool that shows the error. — 463035818_is_not_an_ai, Oct 28 '22 at 08:03
CLion uses Clang for its "intellisense", but unfortunately only MSVC support `std::format` at this time. So you will get false positives in your editor. — Some programmer dude, Oct 28 '22 at 08:06

score 0 · Accepted Answer · answered Oct 28 '22 at 08:37

0

The compiler that your editor uses for highlighting and intellisense doesn't support those features yet.

std::format is a c++20 feature. According to this page it is not yet supported in Clang. This has been discussed here.

answered Oct 28 '22 at 08:37

Eljas Hyyrynen

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Aaah, okay. Damn, in my search it didn't even cross my mind, that this is a new feature. Okay, that explains it, I guess. – J. Baumann Oct 28 '22 at 10:21
Correct. Could you please approve my answer if it answered your question? Thank you and good luck :) – Eljas Hyyrynen Oct 28 '22 at 11:22
Would that be "clang-tidy" that is causing those problems? – J. Baumann Oct 28 '22 at 11:39
@J.Baumann yes, I think so. You can try updating that extension or turning it off. You can find the settings for `clang-tidy` in `Settings/Preferences | Editor | Inspections | C/C++ | General | Clang-Tidy`. I hope it helps. – Eljas Hyyrynen Oct 29 '22 at 18:52

std::format errors "no matching function" and "call to consteval function"

1 Answers1