std::bad_typeid – cppreference.com

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definiert in Header `<typeinfo>`

`class bad_typeid : public std::exception;`

Eine Ausnahme von dieser Art wird ausgelöst, wenn ein

typeid

Betreiber einer dereferenziert Null-Zeiger-Wert oder einer polymorphen Typs angewendet wird .

Original:

An exception of this type is thrown when a

typeid

operator is applied to a dereferenced null pointer value or a polymorphic type.

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Inheritance diagram

Member-Funktionen


	baut eine neue `bad_typeid` Objekt Original: constructs a new `bad_typeid` object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)

Inherited from std::exception

Member functions


	Zerstört das Ausnahme-Objekt Original: destructs the exception object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtuellen öffentlichen Member-Funktion of `std::exception`) [edit]

	gibt einen erläuternden String Original: returns an explanatory string The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtuellen öffentlichen Member-Funktion of `std::exception`) [edit]

Beispiel

#include <iostream>
#include <typeinfo>

struct S { // The type has to be polymorphic
    virtual void f();
}; 

int main()
{
    S* p = nullptr;
    try {
        std::cout << typeid(*p).name() << '\n';
    } catch(const std::bad_typeid& e) {
        std::cout << e.what() << '\n';
    }
}

Output:

Attempted a typeid of NULL pointer!