blob: 0a5047a9f0f51e188c5c2b75b8daf25a60494a26 [file] [log] [blame]
.. title:: clang-tidy - 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.