Reference to selected subset of an array.
A mask_array is a reference to the actual elements of an array specified by a bitmask in the form of an array of bool. The way to get a mask_array is to call operator(valarray<bool>) on a valarray. The returned mask_array then permits carrying operations out on the referenced subset of elements in the original valarray.
For example, if a mask_array is obtained using the array (false, true, false, true) as an argument, the mask array has two elements referring to array and array in the underlying array.
|std::mask_array::mask_array||(||const mask_array &||)|
Copy constructor. Both slices refer to the same underlying array.
Assignment operator. Assigns elements to corresponding elements of a.