cpp/experimental/simd/simd mask/operator at

The subscript operators allow reading and writing single elements of a. @1@ Returns a reference proxy to the i-th element. This proxy type should not be captured into an lvalue. Lvalues of can only convert to. Rvalues of overload assignment and all compound assignment operators as well as. @2@ Returns a prvalue of the i-th element. In contrast to containers, which contain objects of type, a is not a container of individual objects and therefore cannot return an lvalue-reference.