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Строки 1 и 2 - это include guard (страж включения). Правило единственного объявления - это немного другое. Это правило гласит, что идентификатор не может быть объявлен более чем 1 раз в пределах единицы компиляции.
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Проблема аналогичная описанной в конструкторе перемещения.
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