.. _exhale_struct_structrclcpp_1_1detail_1_1can__be__nullptr_3_01T_00_01std_1_1void__t_3_01decltype_07std_1_1declv2b0537326719f6c6b725aee5acf99efb:

Template Struct can_be_nullptr< T, std::void_t< decltype(std::declval< T >, ()==nullptr), decltype(std::declval< T & >, ()=nullptr) > >
=======================================================================================================================================

- Defined in :ref:`file_include_rclcpp_any_service_callback.hpp`


Inheritance Relationships
-------------------------

Base Type
*********

- ``public std::true_type``


Struct Documentation
--------------------


.. doxygenstruct:: rclcpp::detail::can_be_nullptr< T, std::void_t< decltype(std::declval< T >()==nullptr), decltype(std::declval< T & >()=nullptr)> >
   :project: rclcpp Doxygen Project
   :members:
   :protected-members:
   :undoc-members: