.vscode/launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Run cxx demo",
            "type": "lldb",
            "request": "launch",
            "cargo": {
                "args": ["build", "--manifest-path", "demo/Cargo.toml"],
                "filter": {
                    "name": "demo",
                    "kind": "bin"
                }
            }
        }
    ]
}