| 61 | } |
| 62 | |
| 63 | Duration operator+(const Duration& left, const Duration& right) { |
| 64 | return Duration(left.seconds() + right.seconds()); |
| 65 | } |
| 66 | |
| 67 | Duration operator-(const Duration& left, const Duration& right) { |
| 68 | return Duration(left.seconds() - right.seconds()); |