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Showing content from https://timsong-cpp.github.io/cppwp/n4140/bad.typeid below:

18 Language support library [language.support]

18.7.3 Class bad_typeid [bad.typeid]
namespace std {
  class bad_typeid : public exception {
  public:
    bad_typeid() noexcept;
    bad_typeid(const bad_typeid&) noexcept;
    bad_typeid& operator=(const bad_typeid&) noexcept;
    virtual const char* what() const noexcept;
  };
}

The class bad_typeid defines the type of objects thrown as exceptions by the implementation to report a null pointer in a typeid expression ([expr.typeid]).

bad_typeid() noexcept;

Effects: Constructs an object of class bad_typeid.

Remarks: The result of calling what() on the newly constructed object is implementation-defined.

bad_typeid(const bad_typeid&) noexcept; bad_typeid& operator=(const bad_typeid&) noexcept;

Effects: Copies an object of class bad_typeid.

virtual const char* what() const noexcept;

Returns: An implementation-defined ntbs.


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