| .. title:: clang-tidy - bugprone-integer-division |
| |
| bugprone-integer-division |
| ========================= |
| |
| Finds cases where integer division in a floating point context is likely to |
| cause unintended loss of precision. |
| |
| No reports are made if divisions are part of the following expressions: |
| |
| - operands of operators expecting integral or bool types, |
| - call expressions of integral or bool types, and |
| - explicit cast expressions to integral or bool types, |
| |
| as these are interpreted as signs of deliberateness from the programmer. |
| |
| Examples: |
| |
| .. code-block:: c++ |
| |
| float floatFunc(float); |
| int intFunc(int); |
| double d; |
| int i = 42; |
| |
| // Warn, floating-point values expected. |
| d = 32 * 8 / (2 + i); |
| d = 8 * floatFunc(1 + 7 / 2); |
| d = i / (1 << 4); |
| |
| // OK, no integer division. |
| d = 32 * 8.0 / (2 + i); |
| d = 8 * floatFunc(1 + 7.0 / 2); |
| d = (double)i / (1 << 4); |
| |
| // OK, there are signs of deliberateness. |
| d = 1 << (i / 2); |
| d = 9 + intFunc(6 * i / 32); |
| d = (int)(i / 32) - 8; |