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设置搜索这几个，并设置为对应值。

如果没解决，可能是clangd的问题。

禁用clangd，然后去看看c_cpp_properties.json。

看complierPath是不是clang。 如果是，改成g++/gcc。

再看一下intelliSenseMode是不是clang。如果是，改为default。

linux下c_cpp_properties.json的配置

1. {
2. "configurations": [
3. {
4. "name": "Linux",
5. "includePath": [
6. "/usr/include",
7. "/usr/local/include",
8. "${workspaceFolder}/**"
9. ],
10. "defines": [],
11. "compilerPath": "/usr/bin/g++",
12. "cStandard": "c23",
13. "cppStandard": "c++20",
14. "browse":{ "path":[
15. "/usr/include",
16. "/usr/local/include",
17. "${workspaceFolder}/**"
18. ]
19. },
20. "intelliSenseMode": "${default}"
21. }
22. ],
23. "version": 4
24. }

windows下c_cpp_properties.json的配置

1. {
2. "configurations": [
3. {
4. "name": "Win32",
5. "includePath": [
6. "D:/programme/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/include/c++",
7. "D:/programme/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/include/c++/x86_64-w64-mingw32",
8. "D:/programme/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/include/c++/backward",
9. "D:/programme/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/include",
10. "D:/programme/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/include-fixed",
11. "D:/programme/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/include"
12. ],
13. "defines": [
14. "_DEBUG",
15. "UNICODE",
16. "_UNICODE"
17. ],
18. "compilerPath": "D:\\programme\\mingw64\\bin\\g++.exe",
19. "cStandard": "c23",
20. "cppStandard": "c++23",
21. "intelliSenseMode": "windows-gcc-x64"
22. },
23. "version": 4
24. }

如果嫌vscode自带的补全太慢，可以更改以下设置(默认为10，建议改到5以下)

参考文章：

VSCode C/C++无法跳转到定义、自动补全、悬停提示功能

VSCode代码自动补全太慢的问题

vscode解决自动补全突然失效的问题(c++)