On Sunday, 24 November 2013 at 14:18:50 UTC, ilya-stromberg wrote:
On Sunday, 24 November 2013 at 14:12:18 UTC, Maxim Fomin wrote:
void* ptr;
if(ptr)
was a shortcut for 'if(ptr != NULL)' probably since C was
created.
Small code change:
import std.stdio;
class Foo
{
}
void main()
{
Foo f;
if(f == null)
{
writeln("f is true");
}
if(f != null)
{
writeln("f is false");
}
}
DMD output:
Error: use 'is' instead of '==' when comparing with null
Error: use '!is' instead of '!=' when comparing with null
So, C style 'if(ptr != NULL)' isn't allowed in D.
Yes, because D is separate language, and its comparison operator
does something special when operands are class references. This
is not the same story as in 'if(f)' which is purely bitwise
comparison.
I think your question is more appropriate for d.learn.
