Пример #1
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 Val const& consumeNew()       { return new_->getElement (newHead_++); }
Пример #2
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 Val const& newElm()     const { return new_->getElement (newHead_); }
Пример #3
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 Val const& consumeOld()       { return old_.getElement (oldHead_++); }
Пример #4
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 Val const& oldElm()     const { return old_.getElement (oldHead_); }