Re: No pointer conversion warning for "bool" in C/C++

[Jon Grant <jg at jguk dot org>]

Jonathan Wakely wrote, On 26/09/11 09:53:
> On 26 September 2011 09:32, Jon Grant wrote:
[.]
> > bool invalid = (NULL == p);
>
> Why is that preferable?

It would be clearer IMHO what was happening.

> > I expect this depends on what the standard allows then.
>
>
> 4.12 Boolean conversions [conv.bool]
> 1  A prvalue of arithmetic, unscoped enumeration, pointer, or pointer
> to member type can be converted to a
> prvalue of type bool. A zero value, null pointer value, or null member
> pointer value is converted to false;
> any other value is converted to true. A prvalue of type std::nullptr_t
> can be converted to a prvalue of
> type bool; the resulting value is false.

I stand corrected. No reason to change anything if it is in the 
standard. Thank you for discussing this point.

Best regards, Jon