Что такое rvalue, lvalue?
lvalue — это всё, что имеет имя, rvalue — это то, что имени не имеет. Исторически сложились такие названия, потому что lvalue всегда было то, что писалось с левой стороны присваивающего выражения, а rvalue — это то, что появлялось только справа от этого выражения.
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