Reference to arbitrary subset of an array.
An indirect_array is a reference to the actual elements of an array specified by an ordered array of indices. The way to get an indirect_array is to call operator(valarray<size_t>) on a valarray. The returned indirect_array then permits carrying operations out on the referenced subset of elements in the original valarray.
For example, if an indirect_array is obtained using the array (4,2,0) as an argument, and then assigned to an array containing (1,2,3), then the underlying array will have array==3, array==2, and array==1.
|std::indirect_array::indirect_array||(||const indirect_array &||)|
Copy constructor. Both slices refer to the same underlying array.
Assignment operator. Assigns elements to corresponding elements of a.