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#include <mutex>
#include <shared_mutex>
#include <condition_variable>

class ReadWriteLock {
std::shared_mutex mtx;
public:
    // Constructor
    ReadWriteLock() {

    }
    
    // Acquire a read lock - multiple readers allowed
    void lockRead() {
      mtx.lock_shared();
    }
    
    // Release a read lock
    void unlockRead() {
      mtx.unlock_shared();
    }
    
    // Acquire a write lock - exclusive access
    void lockWrite() {
      mtx.lock();
    }
    
    // Release a write lock
    void unlockWrite() {
      mtx.unlock();
    }
    
    // Delete copy constructor and assignment operator
    ReadWriteLock(const ReadWriteLock&) = delete;
    ReadWriteLock& operator=(const ReadWriteLock&) = delete;
};