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Message: [QUOTE="Ioannis Vranos, post: 3243416"] In TC++PL3 on page 676, it is mentioned at the bottom: "I introduced a new Vector (rather than using a valarray) because I needed to define assignment (and assignment must be a member function; 11.2.2). However, valarray is a strong candidate for the representation of that Vector". OK, the assignment must be defined in a way that performs the evaluation of U=M*V+W, so we can't use a valarray directly since it has its assignment operations already defined. However (and having checked 11.2.2 where I did not find something relevant), "must assignment be a member function" always? [/QUOTE]