variadic templates :: unpacking template arguments

[alexander.svk]

If in functions this is possible to unpack the traiing parameter at first, why it's not in classes.

 

[SG]

If in functions this is possible to unpack the traiing parameter
at first, why it's not in classes.

Please try again asking a question that can be answered without having
to read your mind. Thanks.

 

[alexander.svk]

вторник, 28 Ð¼Ð°Ñ 2013 г., 13:53:26 UTC+2 пользователь SG напиÑал:

Please try again asking a question that can be answered without having

to read your mind. Thanks.

There're 2 types of contexts for templates. If the context is a class/struct, namely
'...template<typename R, typename ... Args>
struct FunctorImpl<R (Args ...)>...', then the parameteres may be expanded starting from the 'head'. If the context is a function, there's no such restriction.

 

[Victor Bazarov]

вторник, 28 Ð¼Ð°Ñ 2013 г., 13:53:26 UTC+2 пользователь SG напиÑал:

There're 2 types of contexts for templates. If the context is a class/struct, namely
'...template<typename R, typename ... Args>
struct FunctorImpl<R (Args ...)>...', then the parameteres may be expanded starting from the 'head'. If the context is a function, there's no such restriction.

"Such" restriction? Which restriction is that?

V