std::array::data
From cppreference.com
                    
                                        
                    
                    
                                                            
                    
|   T* data(); 
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(since C++11) | |
|   const T* data() const; 
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(since C++11) | |
Returns pointer to the underlying array serving as element storage. The pointer is such that range [data(); data() + size()) is always a valid range, even if the container is empty.
Contents | 
[edit] Parameters
(none)
[edit] Return value
Pointer to the underlying element storage. For non-empty containers, returns &front()
[edit] Complexity
Constant.
[edit] Exceptions
[edit] See also
|    access the first element   (public member function)  | 
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|    access the last element   (public member function)  | 
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