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I'm sorry I lost sending comments.
I finally understood the meaning of the word you are saying.
I rewrote it with reference to your advice, but under this condition it is the limit to reduce the number of variables down to two.
If you can use smart pointers, you can only have one variable as you say.
Although I am using google translation, I feel that translated English is wrong,
I am worried whether it will succeed.
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I'm sorry I lost sending comments. I finally understood the meaning of the word you are saying. I rewrote it with reference to your advice, but under this condition it is the limit to reduce the number of variables down to two. If you can use smart pointers, you can only have one variable as you say.
Although I am using google translation, I feel that translated English is wrong, I am worried whether it will succeed.