Program Listing for File createSafeCallback.hpp

↰ Return to documentation for file (include/bondcpp/createSafeCallback.hpp)

// 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_