std::extents<IndexType,Extents...>::dynamic-index
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std::extents 
 
extents::dynamic-index
private:
static constexpr auto /*dynamic-index*/( rank_type i ) noexcept;
 
 (since C++23) static constexpr auto /*dynamic-index*/( rank_type i ) noexcept;
(exposition only*)
Returns the number of dynamic extents below index i. If i <= rank() is false, the behavior is undefined.
[edit] Parameters
 i
 -
 the index
[edit] Return value
The number of Er with r < i for which Er is a dynamic extent.
[edit] See also
 This section is incomplete