CLion无法解析类型std :: unordered_map，即使它提示我包括标头并且编译工作

Question

For some reason my CLion cannot recognize std::unordered_map even though it actually suggested me to include the header by Alt+Enter when I first wrote out the type definition. After I included the header by #include <unordered_map> , the compilation works as well.

I can even Ctrl+Click on the include line to find the header file, but I can't click on the line of type definition (which keeps remaining red). I don't understand why the IDE keeps refusing to recognize the type within the code.

Actually, it then suggests me to include bits/unordered_map.h . I can find unodered_map.h in both /usr/include/c++/7.3.1/unordered_map and /usr/include/c++/7.3.1/bits/unordered_map.h . I'm not sure what's the difference between these two. Including either or both doesn't solve the problem.

I added -std=c++11 to CMAKE_CXX_FLAGS in my CMakeLists.txt already.

CLion 2018.1, gcc 7.3.1, Arch Linux.

Answer 1

Bad news: it's CLion issue .

Good news: it was fixed. Please try using CLion 2018.1.1 EAP. The issue should be fixed in it.

Here is the related problem .

Answer 2

I don't know about CLion but in Eclipse Luna with TDM-GCC as compiler these errors are usually caused because the project isn't built . Also verify that unordered_map is indeed in the /include folder of your project . You can also include higher std flags like -std=c++14 .

Hope this helps!