Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Class bad_any_cast

boost::bad_any_cast — The exception thrown in the event of a failed any_cast of an any value.

class bad_any_cast : public std::bad_cast {
public:
  virtual const char * what() const;
};

virtual const char * what() const;