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boost::any_cast — Custom keyword cast for extracting a value
          of a given type from an
          any.
// In header: <boost/any.hpp> template<typename T> T any_cast(any & operand); template<typename T> T any_cast(any && operand); template<typename T> T any_cast(const any & operand); template<typename ValueType> const ValueType * any_cast(const any * operand); template<typename ValueType> ValueType * any_cast(any * operand);
| Returns: | If passed a pointer, it returns a similarly qualified pointer to the value content if successful, otherwise null is returned. If T is ValueType, it returns a copy of the held value, otherwise, if T is a reference to (possibly const qualified) ValueType, it returns a reference to the held value. | 
| Throws: | Overloads taking an anypointer do not
          throw; overloads taking ananyvalue or reference
          throwsbad_any_castif
          unsuccessful. |