#ifndef __PER_THREAD_H__
#define __PER_THREAD_H__

#include <assert.h>
#include <pthread.h>

template <typename T>
class PerThread
{
public:
    PerThread()
    {
        assert(pthread_key_create(&m_oKey, destructor) == 0);
    }
    ~PerThread()
    {
        (void)pthread_key_delete(m_oKey);
    }

    T& Get()
    {
        T *value = (T*)pthread_getspecific(m_oKey);
        if (value == NULL)
        {
            value = new T();
            assert(value);
            assert(pthread_setspecific(m_oKey, value) == 0);
        }
        return *value;
    }

private:
    static void destructor(void *value)
    {
        if (value != NULL)
            delete (T*)value;
    }

private:
    pthread_key_t m_oKey;
};

#endif