20 General utilities library [utilities]

20.8 Storage for any type [any]

20.8.3 Class any [any.class]

20.8.3.4 Observers [any.observers]

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bool has_value() const noexcept;
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Returns: true if *this contains an object, otherwise false.
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const type_info& type() const noexcept;
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Returns: typeid(T) if *this has a contained value of type T, otherwise typeid(void).
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[Note
:
Useful for querying against types known either at compile time or only at runtime.
— end note
]