[boost] Re: boost::noncopyable warning in VC7

From: Dirk Gerrits (dirk_at_[hidden])
Date: 2002-11-18 07:35:00

Craig Henderson wrote:

> Hi,
> I am deriving from boost::noncopyable to prevent copying of my 
> objects. When I compile in VC7 with /W4 (warning level 4), I get a 
> warning C4511 - copy constructor could not be generated

Isn't that what boost::noncopyable is supposed to do?

> The documentation states that: "This warning can be caused by having a 
> copy constructor for the base class that is not accessible by the 
> derived class". As a result, I changed the copy ctor and assignment 
> operator to be protected rather than private to make them visible to 
> the derived class, and all is well.

Won't this mean that inside the class, copying will cause a link-time 
failure, and outside of it a compile-time failure? The mistake of 
accidentally copying an instance inside the class itself is probably 
pretty rare, but still, catching errors as early as possible is 
preferable IMHO.

Dirk Gerrits