template<typename_ToType>
struct __gnu_cxx::_Caster< _ToType >"These functions are here to allow containers to support non standard
pointer types. For normal pointers, these resolve to the use of the standard cast operation. For other
types the functions will perform the appropriate cast to/from the custom pointer class so long as that
class meets the following conditions: 1) has a typedef element_type which names tehe type it points to.
2) has a get() const method which returns element_type*. 3) has a constructor which can take one
element_type* argument. This type supports the semantics of the pointer cast operators (below.)