Function get_impl

boost/optional/optional.hpp:444–444

    unspecified_bool_type safe_bool() const { return m_initialized ? &this_type::is_initialized : 0 ; }

    reference_const_type get_impl() const { return dereference(get_object(), is_reference_predicate() ) ; }
    reference_type       get_impl()       { return dereference(get_object(), is_reference_predicate() ) ; }

    pointer_const_type get_ptr_impl() const { return cast_ptr(get_object(), is_reference_predicate() ) ; }