mutable

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http://www.parashift.com/c++-faq-lite/const-correctness.html#faq-18.13

const 로 선언된 object 에 대한 포인터(type * const pointer_name)를 const_cast 로 constness 벗겨내는건 standard 에서 undefined이다.

Use mutable members, instead.

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