[boost] [type_traits] Why is there no total extent?

Subject: [boost] [type_traits] Why is there no total extent?
From: Mostafa (mostafa_working_away_at_[hidden])
Date: 2013-12-01 17:03:34

I was wondering why there is no total_extent in the TypeTraits library.  
total_extent would represent the total number of elements in a complete  
built-in array type, else it would be zero. I would think that this would  
be a natural supplement to the existing extent metafunction. (There is a  
very similar functionality in the smart pointers library, under the name  
of array_total here: smart_ptr/detail/array_traits.hpp)

Mostafa