Geant4 LXR

Cross-Referencing   Geant4
Geant4/externals/ptl/include/PTL/ScopeDestructor.hh

   //
   // MIT License
   // Copyright (c) 2020 Jonathan R. Madsen
   // Permission is hereby granted, free of charge, to any person obtaining a copy
   // of this software and associated documentation files (the "Software"), to deal
   // in the Software without restriction, including without limitation the rights
   // to use, copy, modify, merge, publish, distribute, sublicense, and
   // copies of the Software, and to permit persons to whom the Software is
   // furnished to do so, subject to the following conditions:
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED
  // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
  // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  //
  
  #pragma once
  
  #include <functional>
  #include <utility>
  
  namespace PTL
  {
  struct ScopeDestructor
  {
      template <typename FuncT>
      ScopeDestructor(FuncT&& _func)
      : m_functor(std::forward<FuncT>(_func))
      {}
  
      // delete copy operations
      ScopeDestructor(const ScopeDestructor&) = delete;
      ScopeDestructor& operator=(const ScopeDestructor&) = delete;
  
      // allow move operations
      ScopeDestructor(ScopeDestructor&& rhs) noexcept
      : m_functor(std::move(rhs.m_functor))
      {
          rhs.m_functor = []() {};
      }
  
      ScopeDestructor& operator=(ScopeDestructor&& rhs) noexcept
      {
          if(this != &rhs)
          {
              m_functor     = std::move(rhs.m_functor);
              rhs.m_functor = []() {};
          }
          return *this;
      }
  
      ~ScopeDestructor() { m_functor(); }
  
  private:
      std::function<void()> m_functor = []() {};
  };
  
  }  // namespace PTL