Duckstation/src/common/scope_guard.h

// Copyright 2015 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <optional>

namespace Common
{
template <typename Callable>
class ScopeGuard final
{
public:
  ScopeGuard(Callable&& finalizer) : m_finalizer(std::forward<Callable>(finalizer)) {}

  ScopeGuard(ScopeGuard&& other) : m_finalizer(std::move(other.m_finalizer))
  {
    other.m_finalizer = nullptr;
  }

  ~ScopeGuard() { Exit(); }
  void Dismiss() { m_finalizer.reset(); }
  void Exit()
  {
    if (m_finalizer)
    {
      (*m_finalizer)();  // must not throw
      m_finalizer.reset();
    }
  }

  ScopeGuard(const ScopeGuard&) = delete;

  void operator=(const ScopeGuard&) = delete;

private:
  std::optional<Callable> m_finalizer;
};

}  // Namespace Common