Feature/typelist

This adds template<class...T> struct TypeList {}; together with some utilities. It's e.g. used in the concept checking facility that I'll add soon.

Besides this it can be used to 'store' an argument pack and access its members. In contrast to a std::tuple<T...> which is a container of objects of types T... a TypeList<T...> only captures the types themselves . Hence one can easily create TypeList objects and use them to pass types around or, e.g., in overload resolution where they can be used for tag-dispatch.

Notice that adding a template packer<T...> doing exactly the same has been proposed for the standard in N4115. But in my opinion TypeList is a more instructive name.

I like the proposal, I only have two minor comments... see my code annotations.

Added feature label

Added 2 commits:

• 69133af5 - [cleanup] Also add TypeListElement::type
• 22c410ca - [doc] Fix doxygen group

I just added ::type. However I'd like to keep the *_t because this is the standard pattern that users will expect.

mentioned in merge request !9 (merged)

Any more comments? Otherwise I'll merge this. It's non-intrusive anyway.

mentioned in commit bdbcc7dc

Status changed to merged

mentioned in commit e77ed897

Mentioned in commit bdbcc7dc

Mentioned in commit e77ed897