One Line C++
\nclass Solution {\npublic:\n    int smallestEvenMultiple(int n) {\n        return n & 1 ? (n << 1) : n;\n    }\n};\n
```\nclass Solution {\npublic:\n    int smallestEvenMultiple(int n) {\n        return n & 1 ? (n << 1) : n;\n    }\n};\n```
['C']