Re: SmartPointer & User Conversion & Sucking Compiler

From:

witkamp <theodore.witkamp@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Tue, 12 Jun 2007 16:39:18 -0000

Message-ID:

<1181666358.066968.169540@i13g2000prf.googlegroups.com>

Do you have any template constructors for SmartPointer?
Constructors are included in C++ automatic type conversion system.
The error the you are most likely to be getting is where there is more
than on conversion path between to types.
I bet some constructor the auto type conversion system is trying to
use in the SmartPointer template class.

Thats my thought

On Jun 11, 11:04 pm, coder_...@yahoo.com wrote:

MS VS 7.0 happily resolves by SmartPointer and Inheritance, but I got
to use another target compiler and it does not accept user conversion
for templates. Can I forced a recast somehow? I have judiciously
checked almost all constructs with both compiler before coding, but
during a heavy session, I forgot to check the user conversion part,
and now, I am stuck big time :(

So here is my user conversion for a smart pointer class (direct from
Scott Meyer) :)

public:
        template<class aNewType> operator SmartPointer<aNewType>()
        {
                return SmartPointer<aNewType>(pointee);
        }

For example,

Class Person;
Class Employee : Person
Class Student : Person

SmartPointer<Person> p;
SmartPointer<Employee> e;
SmartPointer<Student> s

p = e; // "Ambigous user conversion"

Can I safely force the recast? I have only 1-level of inheritance,
so maybe there is a quick rewrite that is safe?

Thanks,