C / C++ / MFC

#include <map>
#include <set>
#include <vector>
#include <algorithm>
#include <boost/bind.hpp>

using namespace boost::bind;

typedef int DWORD;
typedef std::pair<std::string, bool> user_info;
typedef std::map<DWORD, user_info> USER_MAP;
typedef std::vector<DWORD> VEC_STAFF;



int _tmain(int argc, _TCHAR* argv[])
{
	USER_MAP m_Users;
	VEC_STAFF Staff;

	VEC_STAFF::iterator it = std::partition(Staff.begin(), Staff.end(),(bind(&USER_MAP::find, m_Users, _1) != m_Users.end()));

struct InUsersMap : public std::unary_function<USER_MAP::key_type,bool>
{
	InUsersMap(USER_MAP & theMap, USER_MAP::const_iterator end)
		: m_theMap(theMap)
	{
	}
	inline bool operator()(CSecurePatients::USER_MAP::key_type& id) const
	{
		return m_theMap.find(id) != m_theMap.end();
	}
private:
	const USER_MAP &m_theMap;
}

ULONG luLogonSessionCount = 0;
LUID *pLogonSessionList = NULL;

NTSTATUS lNtStatus = LsaEnumerateLogonSessions( &luLogonSessionCount, &pLogonSessionList );