mrdocs::nullable_traits<Polymorphic<T>>

nullable_traits for Polymorphic<T>.

Synopsis

template<class T>
struct nullable_traits<Polymorphic<T>>;

Only this friend specialization can create/reset the null state.

Name

Description

Return true if the polymorphic value is disengaged.

Reset the polymorphic value to null.

Return a null polymorphic instance.

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