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.. 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;
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