constexpr reference operator[](index_type idx) const; |
Returns a reference to the idx-th element of the sequence. The behavior is undefined if idx is out of range (i.e., if it is greater than or equal to size()).
| idx | - | the index of the element to access |
A reference to the idx-th element of the sequence, i.e., data()[idx]
(none).
| returns a pointer to the beginning of the sequence of elements (public member function) |
|
| returns the number of elements in the sequence (public member function) |
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