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20 General utilities library [utilities]

20.6 Optional objects [optional]

20.6.3 Class template optional [optional.optional]

20.6.3.2 Destructor [optional.dtor]

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~optional();
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Effects: If is_­trivially_­destructible_­v<T> != true and *this contains a value, calls 
val->T::~T()
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Remarks: If is_­trivially_­destructible_­v<T> is true, then this destructor is trivial.