Re: [Boost-users] (no subject)

From: Kevin Scarr (kscarr_at_[hidden])
Date: 2008-03-22 06:35:06

John Maddock wrote:
> The warnings are raised when a class or structure does *not* have an 
> explicit copy-constructor or assignment operator declared, *and* one could 
> not be generated automatically by the compiler.  However, the warnings are 
> issued even though neither the copy-constructor nor the assignment operator 
> are ever used - if they were used then you would get a compiler error.

I don't mind the errors, but it seems a warning about something not 
required is maybe a little over the top.

> BTW if I remember correctly you get the same warnings if you 
> declare a class that inherits from noncopyable which rather destroys the 
> whole point of that one :-(

You are correct, you do. I tend to be asked to write programs which are 
largely user configurable within their application domain, so all my 
application classes tend to inherit from a base class which links the 
object to the user configuration (eg user names for objects, user 
descriptions, etc) so that all my user-messages are tailored for their 
configuration.

Anyway, I always start with the base class inheriting from noncopyable 
because I really, really only want one instance of each of these objects 
-- many pointers to that instance is fine, but only one actual instance.

Consequently, as you can guess, my compile output is littered with these 
warnings.

> HTH, John. 

Thanks for your comments!
Kevin