I would like to refer you to this address:
http://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/nullptr
Is there any chance tha in your tests int* foo is a member variable? Which
compiler do you use?
The example from the location above compiles fine, except the line:
const int n = 0;
if (nullptr == n) {} // ok
Which IMO is a mistake in the wiki page.
With Kind Regards,
Ovanes Markarian
On Mon, Mar 31, 2008 at 6:57 PM, Robert Dailey
Hi,
I realize that C++03 will not permit functions to evaluate down to compile-time constants. However, I cannot wait until C++0x for this feature. So, I'm hoping that Boost will allow a temporary solution. Consider the following structure:
static struct nullptr_t { template< typename t_type > operator t_type*() { return 0; } } nullptr;
The compiler has everything it needs to turn this code into a single integral constant value. So, if I do the following:
int* foo; if( foo == nullptr ) { }
Then it should evaluate down to:
int* foo; if( foo == 0 ) { }
Is there any way to provide this behavior in Boost? I would like to avoid altering the actual design if possible. Perhaps this actually *does* evaluate to a constant and the problem is that I'm actually unaware of some specific rule that I didn't find in the C++03 standard. Thanks.
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