Keeping binary compatibility

[Thiago Macieira]

Em Terça-feira 05 Outubro 2010, às 14:21:58, Lubos Lunak escreveu:
>  Thanks for saving me the work of refuting your first paragraph by doing so
> in your second paragraph :). And note that at least with gcc NULL already
> is nullptr in practice.

C++ is also happy to convert from pointer to bool if it can. That's why we 
added the private constructor QVariant::QVariant(void*) to Qt 4.7.

The worst part in my opinion is that C++ also happily converts "false" to 
pointer. (false is 0 and 0 can be a pointer)

$ g++ -fsyntax-only -xc++ - <<<'void foo(void *); int main() { foo(false); }'; 
echo $?
0
$ g++ -fsyntax-only -xc++ - <<<'void foo(void *); int main() { foo(true); }'; 
echo $?
<stdin>: In function ‘int main()’:
<stdin>:1: error: cannot convert ‘bool’ to ‘void*’ for argument ‘1’ to ‘void 
foo(void*)’
1

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
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