Re: [boost] Proposal: null pointer class

Subject: Re: [boost] Proposal: null pointer class
From: Simonson, Lucanus J (lucanus.j.simonson_at_[hidden])
Date: 2009-06-15 15:41:49

Stewart, Robert wrote:

>> Why not make it even simpler and more general.
>> 
>> template <typename T>
>> T null() {return T(); }
>> 
>> int main()
>> {
>>    func(NULL);
>>    func(null<char*>());
                ^^^^^

> Presumably, you meant for null() to return T *.  However, that
> doesn't address the overloading ambiguities that can result when
> overloading on int and char *, for example.  That's why a new type is
> needed.   

No, T is char* in my example.  I meant the code to do exactly what I wrote.  This does address the problem of pointer type overloading since you specify the pointer type and it returns the null value of that pointer type.

Regards,
luke