File: integer-division.rst

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (39 lines) | stat: -rw-r--r-- 992 bytes parent folder | download | duplicates (29) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
.. 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;