Extra Clang Tools 5 documentation

clang-tidy - misc-incorrect-roundings

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misc-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.

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