22 General utilities library [utilities]

22.5 Optional objects [optional]

22.5.3 Class template optional [optional.optional]

22.5.3.9 Modifiers [optional.mod]

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constexpr void reset() noexcept;
1
#
Effects: If *this contains a value, calls val.T​::​~T() to destroy the contained value; otherwise no effect.
2
#
Postconditions: *this does not contain a value.

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