AutoSuspendGuard.h

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#pragma once
 
#include <atomic>
 
namespace QGC {
 
class AutoSuspendGuard
{
public:
    explicit AutoSuspendGuard(std::atomic<bool>& flag) : _flag(&flag)
    {
        _flag->store(true, std::memory_order_release);
    }
 
    AutoSuspendGuard(AutoSuspendGuard&& other) noexcept : _flag(other._flag) { other._flag = nullptr; }
 
    AutoSuspendGuard& operator=(AutoSuspendGuard&& other) noexcept
    {
        if (this != &other) {
            release();
            _flag = other._flag;
            other._flag = nullptr;
        }
        return *this;
    }
 
    AutoSuspendGuard(const AutoSuspendGuard&) = delete;
    AutoSuspendGuard& operator=(const AutoSuspendGuard&) = delete;
 
    ~AutoSuspendGuard() { release(); }
 
private:
    void release() noexcept
    {
        if (_flag) {
            _flag->store(false, std::memory_order_release);
            _flag = nullptr;
        }
    }
 
    std::atomic<bool>* _flag;
};
 
}  // namespace QGC