scope_exit.hpp

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// Copyright 2015 Open Source Robotics Foundation, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
// Based on: http://the-witness.net/news/2012/11/scopeexit-in-c11/
// But I changed the lambda to include by reference rather than value, see:
// http://the-witness.net/news/2012/11/scopeexit-in-c11/comment-page-1/#comment-86873
 
#ifndef RCLCPP__SCOPE_EXIT_HPP_
#define RCLCPP__SCOPE_EXIT_HPP_
 
#include <functional>
 
#include "rclcpp/macros.hpp"
 
namespace rclcpp
{
 
template<typename Callable>
struct ScopeExit
{
  explicit ScopeExit(Callable callable)
  : callable_(callable) {}
  ~ScopeExit() {callable_();}
 
private:
  Callable callable_;
};
 
template<typename Callable>
ScopeExit<Callable>
make_scope_exit(Callable callable)
{
  return ScopeExit<Callable>(callable);
}
 
}  // namespace rclcpp
 
#define RCLCPP_SCOPE_EXIT(code) \
  auto RCLCPP_STRING_JOIN(scope_exit_, __LINE__) = rclcpp::make_scope_exit([&]() {code;})
 
#endif  // RCLCPP__SCOPE_EXIT_HPP_