.. _program_listing_file_include_bondcpp_createSafeCallback.hpp:

Program Listing for File createSafeCallback.hpp
===============================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_bondcpp_createSafeCallback.hpp>` (``include/bondcpp/createSafeCallback.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   // Copyright (c) 2009, Willow Garage, Inc. All rights reserved.
   //
   // Redistribution and use in source and binary forms, with or without
   // modification, are permitted provided that the following conditions are met:
   //
   //    * Redistributions of source code must retain the above copyright
   //      notice, this list of conditions and the following disclaimer.
   //
   //    * Redistributions in binary form must reproduce the above copyright
   //      notice, this list of conditions and the following disclaimer in the
   //      documentation and/or other materials provided with the distribution.
   //
   //    * Neither the name of the Willow Garage nor the names of its
   //      contributors may be used to endorse or promote products derived from
   //      this software without specific prior written permission.
   //
   // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   // POSSIBILITY OF SUCH DAMAGE.
   
   #ifndef BONDCPP__CREATESAFECALLBACK_HPP_
   #define BONDCPP__CREATESAFECALLBACK_HPP_
   
   #include <memory>
   #include <type_traits>
   
   // Expects obj to inhert from std::enable_shared_from_this
   template<typename T, typename MessageT>
   auto createSafeSubscriptionMemFuncCallback(
     std::shared_ptr<T> obj,
     void (T::* memberFunc)(const MessageT &))
   {
     static_assert(
       std::is_base_of_v<std::enable_shared_from_this<T>, T>,
       "Type expected to inherit from std::enable_shared_from_this");
   
     std::weak_ptr<T> weak_obj = obj;
     return [weak_obj, memberFunc](const MessageT & msg) {
              if (auto shared_obj = weak_obj.lock()) {
                ((*shared_obj).*memberFunc)(msg);
              }
            };
   }
   
   #endif  // BONDCPP__CREATESAFECALLBACK_HPP_