On Sat, Aug 19, 2023, 7:27 PM Celelibi <celel...@gmail.com> wrote:
> 2023-08-04 8:18 UTC+02:00, daniil.arashkev...@gmail.com
> <daniil.arashkev...@gmail.com>:
> > Currently in Python we have construction like this:
> >
> > tt = 5
> > while t:
> > # do something
> > tt -= 1
> >
> > It would be great if in Python we have something like this:
> > tt = 5
> > while (tt--):
> > # do something
> >
> > It is exists in C++. And in my opinion it is very Pythonic
>
> Just as a reminder of C/C++: {pre,post}-{inc,dec}rementations bring
> their lot of issues with the language. Mostly the infamous *undefined
> behavors*. If you've done some C or C++ this very expression might
> send shivers down your spine.
>
>From "Increment (++) and decrement (--) operators should not be used in a
method call or mixed with other operators in an expression"
https://rules.sonarsource.com/cpp/RSPEC-881/ :
***
### Noncompliant code example
u8a = ++u8b + u8c--;
foo = bar++ / 4;
### Compliant solution
The following sequence is clearer and therefore safer:
++u8b;
u8a = u8b + u8c;
u8c--;
foo = bar / 4;
bar++;
## Resources
- MISRA C:2004, 12.1 - Limited dependence should be placed on the C
operator precedence rules in expressions.
- MISRA C:2004, 12.13 - The increment (++) and decrement (--) operators
should not be mixed with other operators in an expression.
- MISRA C++:2008, 5-2-10 - The increment (++) and decrement (--) operator
should not be mixed with other operators in an expression.
- MISRA C:2012, 12.1 - The precedence of operators within expressions
should be made explicit
- MISRA C:2012, 13.3 - A full expression containing an increment (++) or
decrement (--) operator should have no other potential side effects other
than that cause by the increment or decrement operator
- CERT, EXP30-C. - Do not depend on the order of evaluation for side effects
- CERT, EXP50-CPP. - Do not depend on the order of evaluation for side
effects
- CERT, EXP05-J. - Do not follow a write by a subsequent write or read of
the same object within an expression
***
https://awesome-safety-critical.readthedocs.io/en/latest/ links to e.g.
MISRA, CERT
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