C++ Return Type Error Please Help

Question

template <typename T> class ClassOne
{
typedef std::list<classA> pos;

pos All();
}

How can I define function All out side class
I try ( template<typename T> ClassOne<T>::pos ClassOne<T>::All() { } )
And I run into some kind of return issue

HELP!!!!!!!!!!!!!!!

Answer 1

Due to lookup problems with dependent types, the language specifies that in general a dependent qualified name does not denote a type unless prefixed by the typename keyword.
Since the scope ClassOne< T > is dependent on the template parameter, the type ClassOne< T >::pos falls under this category, despite "pos" not being dependent itself. Therefore, you need to prefix it with typename in the function definition, i.e.

template < typename T >
typename ClassOne< T >::pos ClassOne< T >::All() {}

Read through this thread for more information about when to use typename:

https://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-the-template-and-typename-keywords

It might lead you deep down into the rabbit hole that C++ templates really are. You have been warned.

Answer 2

https://code.sololearn.com/cvWOswb6Om3c/?ref=app
Take a look.

Answer 3

CarrieForle lol, I just wrote the same.

Answer 4

I don't quite understand what you mean. You mean something like this?
https://code.sololearn.com/cHB8cuGhyL58/?ref=app

Answer 5

U have no idea, how u just saved me from 3 days headache
TAHNKYOU ALL!!!!!!!!!!!!!!!!!
Keep up a good work guys!!

Dame!! it feel good to shut compiler mouth