#include <windows.h>

class CriticalSection
{
public:
    CriticalSection()
    {
        InitializeCriticalSection(&m_cs);
    }
    ~CriticalSection()
    {
        DeleteCriticalSection(&m_cs);
    }
    void enterCriticalSection()
    {
        EnterCriticalSection(&m_cs);
    }
    void leaveCriticalSection()
    {
        LeaveCriticalSection(&m_cs);
    }
protected:
private:
    CRITICAL_SECTION m_cs;
};

template<class T>
class SharedMemory
{
public:
    SharedMemory() { m_empty = true;}
    ~SharedMemory() {}

    T getData(bool& validreturn)
    {
        m_cs.enterCriticalSection();
        if (m_empty)
        {
            m_cs.leaveCriticalSection();
            validreturn = false;
            return T();
        }
        //Data in the shared memory
        T data = m_data;
        m_empty = true;
        m_cs.leaveCriticalSection();
        validreturn = true;
        return data;
    }
    bool setData(const T& data)
    {
        m_cs.enterCriticalSection();
        if (!m_empty)
        {
            m_cs.leaveCriticalSection();
            return false;
        }
        //Shared memory is empty so fill it
        m_data = data;
        m_empty = false;
        m_cs.leaveCriticalSection();
        return true;
    }
protected:
private:
    T m_data;
    bool m_empty;
    CriticalSection m_cs;
};