Re: non-const reference to tem****ary derived from pure virtual Base

reppisch schrieb:
>   // not ok!
>   u.useBase(Derived(1));
>   //*  no matching function for call to `User::useBase(Derived)'
>   //*   candidates are: void User::useBase(Base&)
>   // seems that the compiler refuses to make a
>   // non-const reference to a tem****ary

Exactly that. Tem****aries are like rvalues.

I had a similar question some time ago (maybe in the german group). 
Somebody explained me that this is intended by the standard, because 
there are risks otherwise.

You must create a non-tem****ary object for this purpuse.

   Derived d(1);
   u.useBase(d);

Marcel