#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;
};