Re: [Boost-users] can't extend boost::any on windows

Subject: Re: [Boost-users] can't extend boost::any on windows
From: Michael Linck (mgl_at_[hidden])
Date: 2008-12-16 14:02:14

> msvc gets the copy constructor and assignment operator wrong in
> the presence of a templated base class constructor/assignment operator.
>
> You need to define them explicitly.
>
> class Value : public boost::any {
> public:
>    // <snip>
>    Value(const Value& arg) : boost::any(static_cast<const 
> boost::any&>(arg)){}
>    Value& operator=(const Value& arg) {
>        static_cast<Value&>(*this) = static_cast<const boost::any&>(arg);
>    }
> };

thanks, I was trying to do about the same thing, but using 
reinterpret_cast, which also caused unrecoverable errors.  I guess I'm 
not sure what the semantic difference between the two is, but that's 
probably a question for a different list and a different day.  In the 
meantime, I made my type non-copyable, wrapped it in shared_ptrs which 
is faster anyway, and got it working that way.  But your I definitely 
appreciate the answer since that would have been bugging me for days 
otherwise.

mike