C/C++/ObjC

c_cpp_properties.json

{
    "configurations": [
        {
            "name": "Mac",
            "C_Cpp.intelliSenseEngine": "Default",
            "includePath": [
                "${workspaceRoot}/include",
                "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0/include"
            ],
            "intelliSenseMode": "clang-x64",
            "browse": {
                "path": [
                    "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1",
                    "/usr/local/include",
                    "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0/include",
                    "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include",
                    "/usr/include",
                    "${workspaceRoot}"
                ]
            },
            "macFrameworkPath": [
                "/System/Library/Frameworks",
                "/Library/Frameworks"
            ]
        }
    ],
    "version": 3
}

settings.json

// add to .vscode/settings.json if working in an Obj-C project
{
    "files.associations": {
        "*.h": "objective-cpp",
        "*.m": "objective-cpp"
    }
}

stdclangpath.txt

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0/include/