| 25 | */ |
| 26 | template <class To, class Rep, class Period> |
| 27 | To round(const duration<Rep, Period>& d) |
| 28 | { |
| 29 | typedef typename common_type<To, duration<Rep, Period> >::type result_type; |
| 30 | result_type diff0; |
| 31 | result_type diff1; |
| 32 | |
| 33 | To t0 = duration_cast<To>(d); |
| 34 | To t1 = t0; |
| 35 | if (t0>d) { |
| 36 | --t1; |
| 37 | diff0 = t0 - d; |
| 38 | diff1 = d - t1; |
| 39 | } else { |
| 40 | ++t1; |
| 41 | diff0 = d - t0; |
| 42 | diff1 = t1 - d; |
| 43 | } |
| 44 | |
| 45 | if (diff0 == diff1) |
| 46 | { |
| 47 | if (t0.count() & 1) |
| 48 | return t1; |
| 49 | return t0; |
| 50 | } |
| 51 | else if (diff0 < diff1) |
| 52 | return t0; |
| 53 | return t1; |
| 54 | } |
| 55 | |
| 56 | } // namespace chrono |
| 57 | } // namespace boost |
no test coverage detected