std::mask_array::mask_array
From cppreference.com
                    
                                        
                    < cpp | numeric | valarray | mask array
                    
                                                            
                    
|   mask_array( const mask_array& other );  | 
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|   mask_array() = delete;  | 
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Constructs a mask_array from another mask_array other. 
The default constructor is implicitly deleted.
Parameters
| other | - |   mask_array to initialize with
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