std::extents<IndexType,Extents...>::dynamic-index-inv
Min standard notice:
Returns the number r such that in range [0,r + 1) there are exactly [0,i + 1) dynamic extents. If i <= rank_dynamic() is false, the behavior is undefined.
# Declarations
private:
static constexpr auto /*dynamic-index-inv*/( rank_type i ) noexcept;
(since C++23) (exposition only*)
# Parameters
i: the index
# Return value
The minimum value of r such that dynamic-index(r + 1) == i + 1 is true.