| .. title:: clang-tidy - bugprone-incorrect-roundings |
| |
| bugprone-incorrect-roundings |
| ============================ |
| |
| Checks the usage of patterns known to produce incorrect rounding. |
| Programmers often use:: |
| |
| (int)(double_expression + 0.5) |
| |
| to round the double expression to an integer. The problem with this: |
| |
| 1. It is unnecessarily slow. |
| 2. It is incorrect. The number 0.499999975 (smallest representable float |
| number below 0.5) rounds to 1.0. Even worse behavior for negative |
| numbers where both -0.5f and -1.4f both round to 0.0. |
