finally.hpp

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// SPDX-FileCopyrightText: Deutsches Elektronen-Synchrotron DESY, MSK, ChimeraTK Project <chimeratk-support@desy.de>
// SPDX-License-Identifier: LGPL-3.0-or-later
#pragma once
 
#include <utility>
 
// Taken from GSL library, https://github.com/Microsoft/GSL/blob/master/include/gsl/gsl_util
// Original Licence: MIT
 
namespace cppext {
 
  template<class F>
  class final_act {
   public:
    explicit final_act(F f) noexcept : f_(std::move(f)), invoke_(true) {}
 
    final_act(final_act&& other) noexcept : f_(std::move(other.f_)), invoke_(other.invoke_) { other.invoke_ = false; }
 
    final_act(const final_act&) = delete;
    final_act& operator=(const final_act&) = delete;
 
    ~final_act() noexcept {
      if(invoke_) f_();
    }
 
   private:
    F f_;
    bool invoke_;
  };
 
  template<class F>
  inline final_act<F> finally(const F& f) noexcept {
    return final_act<F>(f);
  }
 
  template<class F>
  inline final_act<F> finally(F&& f) noexcept {
    return final_act<F>(std::forward<F>(f));
  }
 
} // namespace cppext